// =================== DO NOT EDIT THIS FILE ====================
   //  Generated by Modello Velocity from transformer.vm
   //  template, any modifications will be overwritten.
   // ==============================================================
   package org.apache.maven.model.v4;
   
   import java.io.ObjectStreamException;
   import java.util.AbstractList;
   import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Objects;
  import java.util.function.BinaryOperator;
  import java.util.function.Function;
  import java.util.stream.Collectors;
  
  import org.apache.maven.api.annotations.Generated;
  import org.apache.maven.api.xml.XmlNode;
  import org.apache.maven.api.model.Model;
  import org.apache.maven.api.model.ModelBase;
  import org.apache.maven.api.model.PluginContainer;
  import org.apache.maven.api.model.PluginConfiguration;
  import org.apache.maven.api.model.BuildBase;
  import org.apache.maven.api.model.Build;
  import org.apache.maven.api.model.CiManagement;
  import org.apache.maven.api.model.Notifier;
  import org.apache.maven.api.model.Contributor;
  import org.apache.maven.api.model.Dependency;
  import org.apache.maven.api.model.Developer;
  import org.apache.maven.api.model.Exclusion;
  import org.apache.maven.api.model.IssueManagement;
  import org.apache.maven.api.model.DistributionManagement;
  import org.apache.maven.api.model.License;
  import org.apache.maven.api.model.MailingList;
  import org.apache.maven.api.model.Organization;
  import org.apache.maven.api.model.PatternSet;
  import org.apache.maven.api.model.Parent;
  import org.apache.maven.api.model.Scm;
  import org.apache.maven.api.model.FileSet;
  import org.apache.maven.api.model.Resource;
  import org.apache.maven.api.model.RepositoryBase;
  import org.apache.maven.api.model.Repository;
  import org.apache.maven.api.model.DeploymentRepository;
  import org.apache.maven.api.model.RepositoryPolicy;
  import org.apache.maven.api.model.Site;
  import org.apache.maven.api.model.ConfigurationContainer;
  import org.apache.maven.api.model.Plugin;
  import org.apache.maven.api.model.PluginExecution;
  import org.apache.maven.api.model.DependencyManagement;
  import org.apache.maven.api.model.PluginManagement;
  import org.apache.maven.api.model.Reporting;
  import org.apache.maven.api.model.Profile;
  import org.apache.maven.api.model.Activation;
  import org.apache.maven.api.model.ActivationProperty;
  import org.apache.maven.api.model.ActivationOS;
  import org.apache.maven.api.model.ActivationFile;
  import org.apache.maven.api.model.ReportPlugin;
  import org.apache.maven.api.model.ReportSet;
  import org.apache.maven.api.model.Prerequisites;
  import org.apache.maven.api.model.Relocation;
  import org.apache.maven.api.model.Extension;
  import org.apache.maven.api.model.InputLocation;
  import org.apache.maven.api.model.InputSource;
  import org.codehaus.plexus.util.xml.Xpp3Dom;
  
  @Generated
  public class MavenTransformer {
  
      private final Function<String, String> transformer;
  
      public MavenTransformer(Function<String, String> transformer) {
          this.transformer = transformer;
      }
  
      /**
       * Transforms the given model
       */
      public Model visit(Model target) {
          Objects.requireNonNull(target, "target cannot be null");
          return transformModel(target);
      }
  
      /**
       * The transformation function.
       */
      protected String transform(String value) {
          return transformer.apply(value);
      }
  
      protected Model transformModel(Model target) {
          if (target == null) {
              return null;
          }
          Model.Builder builder = Model.newBuilder(target);
         transformModel_ModelVersion(builder, target);
         transformModel_Parent(builder, target);
         transformModel_GroupId(builder, target);
         transformModel_ArtifactId(builder, target);
         transformModel_Version(builder, target);
         transformModel_Packaging(builder, target);
         transformModel_Name(builder, target);
         transformModel_Description(builder, target);
         transformModel_Url(builder, target);
         transformModel_ChildProjectUrlInheritAppendPath(builder, target);
         transformModel_Root(builder, target);
         transformModel_PreserveModelVersion(builder, target);
         transformModel_InceptionYear(builder, target);
         transformModel_Organization(builder, target);
         transformModel_Licenses(builder, target);
         transformModel_Developers(builder, target);
         transformModel_Contributors(builder, target);
         transformModel_MailingLists(builder, target);
         transformModel_Prerequisites(builder, target);
         transformModelBase_Modules(builder, target);
         transformModel_Scm(builder, target);
         transformModel_IssueManagement(builder, target);
         transformModel_CiManagement(builder, target);
         transformModelBase_DistributionManagement(builder, target);
         transformModelBase_Properties(builder, target);
         transformModelBase_DependencyManagement(builder, target);
         transformModelBase_Dependencies(builder, target);
         transformModelBase_Repositories(builder, target);
         transformModelBase_PluginRepositories(builder, target);
         transformModel_Build(builder, target);
         transformModelBase_Reporting(builder, target);
         transformModel_Profiles(builder, target);
         return builder.build();
     }
 
     protected void transformModel_ModelVersion(Model.Builder builder, Model target) {
         String newVal = transform(target.getModelVersion());
         builder.modelVersion(newVal != target.getModelVersion() ? newVal : null);
     }
     protected void transformModel_Parent(Model.Builder builder, Model target) {
         Parent newVal = transformParent(target.getParent());
         builder.parent(newVal != target.getParent() ? newVal : null);
     }
     protected void transformModel_GroupId(Model.Builder builder, Model target) {
         String newVal = transform(target.getGroupId());
         builder.groupId(newVal != target.getGroupId() ? newVal : null);
     }
     protected void transformModel_ArtifactId(Model.Builder builder, Model target) {
         String newVal = transform(target.getArtifactId());
         builder.artifactId(newVal != target.getArtifactId() ? newVal : null);
     }
     protected void transformModel_Version(Model.Builder builder, Model target) {
         String newVal = transform(target.getVersion());
         builder.version(newVal != target.getVersion() ? newVal : null);
     }
     protected void transformModel_Packaging(Model.Builder builder, Model target) {
         String newVal = transform(target.getPackaging());
         builder.packaging(newVal != target.getPackaging() ? newVal : null);
     }
     protected void transformModel_Name(Model.Builder builder, Model target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformModel_Description(Model.Builder builder, Model target) {
         String newVal = transform(target.getDescription());
         builder.description(newVal != target.getDescription() ? newVal : null);
     }
     protected void transformModel_Url(Model.Builder builder, Model target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformModel_ChildProjectUrlInheritAppendPath(Model.Builder builder, Model target) {
         String newVal = transform(target.getChildProjectUrlInheritAppendPath());
         builder.childProjectUrlInheritAppendPath(newVal != target.getChildProjectUrlInheritAppendPath() ? newVal : null);
     }
     protected void transformModel_Root(Model.Builder builder, Model target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformModel_PreserveModelVersion(Model.Builder builder, Model target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformModel_InceptionYear(Model.Builder builder, Model target) {
         String newVal = transform(target.getInceptionYear());
         builder.inceptionYear(newVal != target.getInceptionYear() ? newVal : null);
     }
     protected void transformModel_Organization(Model.Builder builder, Model target) {
         Organization newVal = transformOrganization(target.getOrganization());
         builder.organization(newVal != target.getOrganization() ? newVal : null);
     }
     protected void transformModel_Licenses(Model.Builder builder, Model target) {
         builder.licenses(transform(target.getLicenses(), this::transformLicense));
     }
     protected void transformModel_Developers(Model.Builder builder, Model target) {
         builder.developers(transform(target.getDevelopers(), this::transformDeveloper));
     }
     protected void transformModel_Contributors(Model.Builder builder, Model target) {
         builder.contributors(transform(target.getContributors(), this::transformContributor));
     }
     protected void transformModel_MailingLists(Model.Builder builder, Model target) {
         builder.mailingLists(transform(target.getMailingLists(), this::transformMailingList));
     }
     protected void transformModel_Prerequisites(Model.Builder builder, Model target) {
         Prerequisites newVal = transformPrerequisites(target.getPrerequisites());
         builder.prerequisites(newVal != target.getPrerequisites() ? newVal : null);
     }
     protected void transformModel_Modules(Model.Builder builder, Model target) {
         builder.modules(transform(target.getModules(), this::transform));
     }
     protected void transformModel_Scm(Model.Builder builder, Model target) {
         Scm newVal = transformScm(target.getScm());
         builder.scm(newVal != target.getScm() ? newVal : null);
     }
     protected void transformModel_IssueManagement(Model.Builder builder, Model target) {
         IssueManagement newVal = transformIssueManagement(target.getIssueManagement());
         builder.issueManagement(newVal != target.getIssueManagement() ? newVal : null);
     }
     protected void transformModel_CiManagement(Model.Builder builder, Model target) {
         CiManagement newVal = transformCiManagement(target.getCiManagement());
         builder.ciManagement(newVal != target.getCiManagement() ? newVal : null);
     }
     protected void transformModel_DistributionManagement(Model.Builder builder, Model target) {
         DistributionManagement newVal = transformDistributionManagement(target.getDistributionManagement());
         builder.distributionManagement(newVal != target.getDistributionManagement() ? newVal : null);
     }
     protected void transformModel_Properties(Model.Builder builder, Model target) {
         Map<String, String> props = target.getProperties();
         Map<String, String> newProps = null;
         for (Map.Entry<String, String> entry : props.entrySet()) {
             String newVal = transform(entry.getValue());
             if (newVal != null && newVal != entry.getValue()) {
                 if (newProps == null) {
                     newProps = new HashMap<>();
                     newProps.putAll(props);
                     builder.properties(newProps);
                 }
                 newProps.put(entry.getKey(), newVal);
             }
         }
     }
     protected void transformModel_DependencyManagement(Model.Builder builder, Model target) {
         DependencyManagement newVal = transformDependencyManagement(target.getDependencyManagement());
         builder.dependencyManagement(newVal != target.getDependencyManagement() ? newVal : null);
     }
     protected void transformModel_Dependencies(Model.Builder builder, Model target) {
         builder.dependencies(transform(target.getDependencies(), this::transformDependency));
     }
     protected void transformModel_Repositories(Model.Builder builder, Model target) {
         builder.repositories(transform(target.getRepositories(), this::transformRepository));
     }
     protected void transformModel_PluginRepositories(Model.Builder builder, Model target) {
         builder.pluginRepositories(transform(target.getPluginRepositories(), this::transformRepository));
     }
     protected void transformModel_Build(Model.Builder builder, Model target) {
         Build newVal = transformBuild(target.getBuild());
         builder.build(newVal != target.getBuild() ? newVal : null);
     }
     protected void transformModel_Reporting(Model.Builder builder, Model target) {
         Reporting newVal = transformReporting(target.getReporting());
         builder.reporting(newVal != target.getReporting() ? newVal : null);
     }
     protected void transformModel_Profiles(Model.Builder builder, Model target) {
         builder.profiles(transform(target.getProfiles(), this::transformProfile));
     }
 
     protected ModelBase transformModelBase(ModelBase target) {
         if (target == null) {
             return null;
         }
         ModelBase.Builder builder = ModelBase.newBuilder(target);
         transformModelBase_Modules(builder, target);
         transformModelBase_DistributionManagement(builder, target);
         transformModelBase_Properties(builder, target);
         transformModelBase_DependencyManagement(builder, target);
         transformModelBase_Dependencies(builder, target);
         transformModelBase_Repositories(builder, target);
         transformModelBase_PluginRepositories(builder, target);
         transformModelBase_Reporting(builder, target);
         return builder.build();
     }
 
     protected void transformModelBase_Modules(ModelBase.Builder builder, ModelBase target) {
         builder.modules(transform(target.getModules(), this::transform));
     }
     protected void transformModelBase_DistributionManagement(ModelBase.Builder builder, ModelBase target) {
         DistributionManagement newVal = transformDistributionManagement(target.getDistributionManagement());
         builder.distributionManagement(newVal != target.getDistributionManagement() ? newVal : null);
     }
     protected void transformModelBase_Properties(ModelBase.Builder builder, ModelBase target) {
         Map<String, String> props = target.getProperties();
         Map<String, String> newProps = null;
         for (Map.Entry<String, String> entry : props.entrySet()) {
             String newVal = transform(entry.getValue());
             if (newVal != null && newVal != entry.getValue()) {
                 if (newProps == null) {
                     newProps = new HashMap<>();
                     newProps.putAll(props);
                     builder.properties(newProps);
                 }
                 newProps.put(entry.getKey(), newVal);
             }
         }
     }
     protected void transformModelBase_DependencyManagement(ModelBase.Builder builder, ModelBase target) {
         DependencyManagement newVal = transformDependencyManagement(target.getDependencyManagement());
         builder.dependencyManagement(newVal != target.getDependencyManagement() ? newVal : null);
     }
     protected void transformModelBase_Dependencies(ModelBase.Builder builder, ModelBase target) {
         builder.dependencies(transform(target.getDependencies(), this::transformDependency));
     }
     protected void transformModelBase_Repositories(ModelBase.Builder builder, ModelBase target) {
         builder.repositories(transform(target.getRepositories(), this::transformRepository));
     }
     protected void transformModelBase_PluginRepositories(ModelBase.Builder builder, ModelBase target) {
         builder.pluginRepositories(transform(target.getPluginRepositories(), this::transformRepository));
     }
     protected void transformModelBase_Reporting(ModelBase.Builder builder, ModelBase target) {
         Reporting newVal = transformReporting(target.getReporting());
         builder.reporting(newVal != target.getReporting() ? newVal : null);
     }
 
     protected PluginContainer transformPluginContainer(PluginContainer target) {
         if (target == null) {
             return null;
         }
         PluginContainer.Builder builder = PluginContainer.newBuilder(target);
         transformPluginContainer_Plugins(builder, target);
         return builder.build();
     }
 
     protected void transformPluginContainer_Plugins(PluginContainer.Builder builder, PluginContainer target) {
         builder.plugins(transform(target.getPlugins(), this::transformPlugin));
     }
 
     protected PluginConfiguration transformPluginConfiguration(PluginConfiguration target) {
         if (target == null) {
             return null;
         }
         PluginConfiguration.Builder builder = PluginConfiguration.newBuilder(target);
         transformPluginConfiguration_PluginManagement(builder, target);
         transformPluginContainer_Plugins(builder, target);
         return builder.build();
     }
 
     protected void transformPluginConfiguration_PluginManagement(PluginConfiguration.Builder builder, PluginConfiguration target) {
         PluginManagement newVal = transformPluginManagement(target.getPluginManagement());
         builder.pluginManagement(newVal != target.getPluginManagement() ? newVal : null);
     }
     protected void transformPluginConfiguration_Plugins(PluginConfiguration.Builder builder, PluginConfiguration target) {
         builder.plugins(transform(target.getPlugins(), this::transformPlugin));
     }
 
     protected BuildBase transformBuildBase(BuildBase target) {
         if (target == null) {
             return null;
         }
         BuildBase.Builder builder = BuildBase.newBuilder(target);
         transformBuildBase_DefaultGoal(builder, target);
         transformBuildBase_Resources(builder, target);
         transformBuildBase_TestResources(builder, target);
         transformBuildBase_Directory(builder, target);
         transformBuildBase_FinalName(builder, target);
         transformBuildBase_Filters(builder, target);
         transformPluginConfiguration_PluginManagement(builder, target);
         transformPluginContainer_Plugins(builder, target);
         return builder.build();
     }
 
     protected void transformBuildBase_DefaultGoal(BuildBase.Builder builder, BuildBase target) {
         String newVal = transform(target.getDefaultGoal());
         builder.defaultGoal(newVal != target.getDefaultGoal() ? newVal : null);
     }
     protected void transformBuildBase_Resources(BuildBase.Builder builder, BuildBase target) {
         builder.resources(transform(target.getResources(), this::transformResource));
     }
     protected void transformBuildBase_TestResources(BuildBase.Builder builder, BuildBase target) {
         builder.testResources(transform(target.getTestResources(), this::transformResource));
     }
     protected void transformBuildBase_Directory(BuildBase.Builder builder, BuildBase target) {
         String newVal = transform(target.getDirectory());
         builder.directory(newVal != target.getDirectory() ? newVal : null);
     }
     protected void transformBuildBase_FinalName(BuildBase.Builder builder, BuildBase target) {
         String newVal = transform(target.getFinalName());
         builder.finalName(newVal != target.getFinalName() ? newVal : null);
     }
     protected void transformBuildBase_Filters(BuildBase.Builder builder, BuildBase target) {
         builder.filters(transform(target.getFilters(), this::transform));
     }
     protected void transformBuildBase_PluginManagement(BuildBase.Builder builder, BuildBase target) {
         PluginManagement newVal = transformPluginManagement(target.getPluginManagement());
         builder.pluginManagement(newVal != target.getPluginManagement() ? newVal : null);
     }
     protected void transformBuildBase_Plugins(BuildBase.Builder builder, BuildBase target) {
         builder.plugins(transform(target.getPlugins(), this::transformPlugin));
     }
 
     protected Build transformBuild(Build target) {
         if (target == null) {
             return null;
         }
         Build.Builder builder = Build.newBuilder(target);
         transformBuild_SourceDirectory(builder, target);
         transformBuild_ScriptSourceDirectory(builder, target);
         transformBuild_TestSourceDirectory(builder, target);
         transformBuild_OutputDirectory(builder, target);
         transformBuild_TestOutputDirectory(builder, target);
         transformBuild_Extensions(builder, target);
         transformBuildBase_DefaultGoal(builder, target);
         transformBuildBase_Resources(builder, target);
         transformBuildBase_TestResources(builder, target);
         transformBuildBase_Directory(builder, target);
         transformBuildBase_FinalName(builder, target);
         transformBuildBase_Filters(builder, target);
         transformPluginConfiguration_PluginManagement(builder, target);
         transformPluginContainer_Plugins(builder, target);
         return builder.build();
     }
 
     protected void transformBuild_SourceDirectory(Build.Builder builder, Build target) {
         String newVal = transform(target.getSourceDirectory());
         builder.sourceDirectory(newVal != target.getSourceDirectory() ? newVal : null);
     }
     protected void transformBuild_ScriptSourceDirectory(Build.Builder builder, Build target) {
         String newVal = transform(target.getScriptSourceDirectory());
         builder.scriptSourceDirectory(newVal != target.getScriptSourceDirectory() ? newVal : null);
     }
     protected void transformBuild_TestSourceDirectory(Build.Builder builder, Build target) {
         String newVal = transform(target.getTestSourceDirectory());
         builder.testSourceDirectory(newVal != target.getTestSourceDirectory() ? newVal : null);
     }
     protected void transformBuild_OutputDirectory(Build.Builder builder, Build target) {
         String newVal = transform(target.getOutputDirectory());
         builder.outputDirectory(newVal != target.getOutputDirectory() ? newVal : null);
     }
     protected void transformBuild_TestOutputDirectory(Build.Builder builder, Build target) {
         String newVal = transform(target.getTestOutputDirectory());
         builder.testOutputDirectory(newVal != target.getTestOutputDirectory() ? newVal : null);
     }
     protected void transformBuild_Extensions(Build.Builder builder, Build target) {
         builder.extensions(transform(target.getExtensions(), this::transformExtension));
     }
     protected void transformBuild_DefaultGoal(Build.Builder builder, Build target) {
         String newVal = transform(target.getDefaultGoal());
         builder.defaultGoal(newVal != target.getDefaultGoal() ? newVal : null);
     }
     protected void transformBuild_Resources(Build.Builder builder, Build target) {
         builder.resources(transform(target.getResources(), this::transformResource));
     }
     protected void transformBuild_TestResources(Build.Builder builder, Build target) {
         builder.testResources(transform(target.getTestResources(), this::transformResource));
     }
     protected void transformBuild_Directory(Build.Builder builder, Build target) {
         String newVal = transform(target.getDirectory());
         builder.directory(newVal != target.getDirectory() ? newVal : null);
     }
     protected void transformBuild_FinalName(Build.Builder builder, Build target) {
         String newVal = transform(target.getFinalName());
         builder.finalName(newVal != target.getFinalName() ? newVal : null);
     }
     protected void transformBuild_Filters(Build.Builder builder, Build target) {
         builder.filters(transform(target.getFilters(), this::transform));
     }
     protected void transformBuild_PluginManagement(Build.Builder builder, Build target) {
         PluginManagement newVal = transformPluginManagement(target.getPluginManagement());
         builder.pluginManagement(newVal != target.getPluginManagement() ? newVal : null);
     }
     protected void transformBuild_Plugins(Build.Builder builder, Build target) {
         builder.plugins(transform(target.getPlugins(), this::transformPlugin));
     }
 
     protected CiManagement transformCiManagement(CiManagement target) {
         if (target == null) {
             return null;
         }
         CiManagement.Builder builder = CiManagement.newBuilder(target);
         transformCiManagement_System(builder, target);
         transformCiManagement_Url(builder, target);
         transformCiManagement_Notifiers(builder, target);
         return builder.build();
     }
 
     protected void transformCiManagement_System(CiManagement.Builder builder, CiManagement target) {
         String newVal = transform(target.getSystem());
         builder.system(newVal != target.getSystem() ? newVal : null);
     }
     protected void transformCiManagement_Url(CiManagement.Builder builder, CiManagement target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformCiManagement_Notifiers(CiManagement.Builder builder, CiManagement target) {
         builder.notifiers(transform(target.getNotifiers(), this::transformNotifier));
     }
 
     protected Notifier transformNotifier(Notifier target) {
         if (target == null) {
             return null;
         }
         Notifier.Builder builder = Notifier.newBuilder(target);
         transformNotifier_Type(builder, target);
         transformNotifier_SendOnError(builder, target);
         transformNotifier_SendOnFailure(builder, target);
         transformNotifier_SendOnSuccess(builder, target);
         transformNotifier_SendOnWarning(builder, target);
         transformNotifier_Address(builder, target);
         transformNotifier_Configuration(builder, target);
         return builder.build();
     }
 
     protected void transformNotifier_Type(Notifier.Builder builder, Notifier target) {
         String newVal = transform(target.getType());
         builder.type(newVal != target.getType() ? newVal : null);
     }
     protected void transformNotifier_SendOnError(Notifier.Builder builder, Notifier target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformNotifier_SendOnFailure(Notifier.Builder builder, Notifier target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformNotifier_SendOnSuccess(Notifier.Builder builder, Notifier target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformNotifier_SendOnWarning(Notifier.Builder builder, Notifier target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformNotifier_Address(Notifier.Builder builder, Notifier target) {
         String newVal = transform(target.getAddress());
         builder.address(newVal != target.getAddress() ? newVal : null);
     }
     protected void transformNotifier_Configuration(Notifier.Builder builder, Notifier target) {
         Map<String, String> props = target.getConfiguration();
         Map<String, String> newProps = null;
         for (Map.Entry<String, String> entry : props.entrySet()) {
             String newVal = transform(entry.getValue());
             if (newVal != null && newVal != entry.getValue()) {
                 if (newProps == null) {
                     newProps = new HashMap<>();
                     newProps.putAll(props);
                     builder.configuration(newProps);
                 }
                 newProps.put(entry.getKey(), newVal);
             }
         }
     }
 
     protected Contributor transformContributor(Contributor target) {
         if (target == null) {
             return null;
         }
         Contributor.Builder builder = Contributor.newBuilder(target);
         transformContributor_Name(builder, target);
         transformContributor_Email(builder, target);
         transformContributor_Url(builder, target);
         transformContributor_Organization(builder, target);
         transformContributor_OrganizationUrl(builder, target);
         transformContributor_Roles(builder, target);
         transformContributor_Timezone(builder, target);
         transformContributor_Properties(builder, target);
         return builder.build();
     }
 
     protected void transformContributor_Name(Contributor.Builder builder, Contributor target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformContributor_Email(Contributor.Builder builder, Contributor target) {
         String newVal = transform(target.getEmail());
         builder.email(newVal != target.getEmail() ? newVal : null);
     }
     protected void transformContributor_Url(Contributor.Builder builder, Contributor target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformContributor_Organization(Contributor.Builder builder, Contributor target) {
         String newVal = transform(target.getOrganization());
         builder.organization(newVal != target.getOrganization() ? newVal : null);
     }
     protected void transformContributor_OrganizationUrl(Contributor.Builder builder, Contributor target) {
         String newVal = transform(target.getOrganizationUrl());
         builder.organizationUrl(newVal != target.getOrganizationUrl() ? newVal : null);
     }
     protected void transformContributor_Roles(Contributor.Builder builder, Contributor target) {
         builder.roles(transform(target.getRoles(), this::transform));
     }
     protected void transformContributor_Timezone(Contributor.Builder builder, Contributor target) {
         String newVal = transform(target.getTimezone());
         builder.timezone(newVal != target.getTimezone() ? newVal : null);
     }
     protected void transformContributor_Properties(Contributor.Builder builder, Contributor target) {
         Map<String, String> props = target.getProperties();
         Map<String, String> newProps = null;
         for (Map.Entry<String, String> entry : props.entrySet()) {
             String newVal = transform(entry.getValue());
             if (newVal != null && newVal != entry.getValue()) {
                 if (newProps == null) {
                     newProps = new HashMap<>();
                     newProps.putAll(props);
                     builder.properties(newProps);
                 }
                 newProps.put(entry.getKey(), newVal);
             }
         }
     }
 
     protected Dependency transformDependency(Dependency target) {
         if (target == null) {
             return null;
         }
         Dependency.Builder builder = Dependency.newBuilder(target);
         transformDependency_GroupId(builder, target);
         transformDependency_ArtifactId(builder, target);
         transformDependency_Version(builder, target);
         transformDependency_Type(builder, target);
         transformDependency_Classifier(builder, target);
         transformDependency_Scope(builder, target);
         transformDependency_SystemPath(builder, target);
         transformDependency_Exclusions(builder, target);
         transformDependency_Optional(builder, target);
         return builder.build();
     }
 
     protected void transformDependency_GroupId(Dependency.Builder builder, Dependency target) {
         String newVal = transform(target.getGroupId());
         builder.groupId(newVal != target.getGroupId() ? newVal : null);
     }
     protected void transformDependency_ArtifactId(Dependency.Builder builder, Dependency target) {
         String newVal = transform(target.getArtifactId());
         builder.artifactId(newVal != target.getArtifactId() ? newVal : null);
     }
     protected void transformDependency_Version(Dependency.Builder builder, Dependency target) {
         String newVal = transform(target.getVersion());
         builder.version(newVal != target.getVersion() ? newVal : null);
     }
     protected void transformDependency_Type(Dependency.Builder builder, Dependency target) {
         String newVal = transform(target.getType());
         builder.type(newVal != target.getType() ? newVal : null);
     }
     protected void transformDependency_Classifier(Dependency.Builder builder, Dependency target) {
         String newVal = transform(target.getClassifier());
         builder.classifier(newVal != target.getClassifier() ? newVal : null);
     }
     protected void transformDependency_Scope(Dependency.Builder builder, Dependency target) {
         String newVal = transform(target.getScope());
         builder.scope(newVal != target.getScope() ? newVal : null);
     }
     protected void transformDependency_SystemPath(Dependency.Builder builder, Dependency target) {
         String newVal = transform(target.getSystemPath());
         builder.systemPath(newVal != target.getSystemPath() ? newVal : null);
     }
     protected void transformDependency_Exclusions(Dependency.Builder builder, Dependency target) {
         builder.exclusions(transform(target.getExclusions(), this::transformExclusion));
     }
     protected void transformDependency_Optional(Dependency.Builder builder, Dependency target) {
         String newVal = transform(target.getOptional());
         builder.optional(newVal != target.getOptional() ? newVal : null);
     }
 
     protected Developer transformDeveloper(Developer target) {
         if (target == null) {
             return null;
         }
         Developer.Builder builder = Developer.newBuilder(target);
         transformDeveloper_Id(builder, target);
         transformContributor_Name(builder, target);
         transformContributor_Email(builder, target);
         transformContributor_Url(builder, target);
         transformContributor_Organization(builder, target);
         transformContributor_OrganizationUrl(builder, target);
         transformContributor_Roles(builder, target);
         transformContributor_Timezone(builder, target);
         transformContributor_Properties(builder, target);
         return builder.build();
     }
 
     protected void transformDeveloper_Id(Developer.Builder builder, Developer target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
     protected void transformDeveloper_Name(Developer.Builder builder, Developer target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformDeveloper_Email(Developer.Builder builder, Developer target) {
         String newVal = transform(target.getEmail());
         builder.email(newVal != target.getEmail() ? newVal : null);
     }
     protected void transformDeveloper_Url(Developer.Builder builder, Developer target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformDeveloper_Organization(Developer.Builder builder, Developer target) {
         String newVal = transform(target.getOrganization());
         builder.organization(newVal != target.getOrganization() ? newVal : null);
     }
     protected void transformDeveloper_OrganizationUrl(Developer.Builder builder, Developer target) {
         String newVal = transform(target.getOrganizationUrl());
         builder.organizationUrl(newVal != target.getOrganizationUrl() ? newVal : null);
     }
     protected void transformDeveloper_Roles(Developer.Builder builder, Developer target) {
         builder.roles(transform(target.getRoles(), this::transform));
     }
     protected void transformDeveloper_Timezone(Developer.Builder builder, Developer target) {
         String newVal = transform(target.getTimezone());
         builder.timezone(newVal != target.getTimezone() ? newVal : null);
     }
     protected void transformDeveloper_Properties(Developer.Builder builder, Developer target) {
         Map<String, String> props = target.getProperties();
         Map<String, String> newProps = null;
         for (Map.Entry<String, String> entry : props.entrySet()) {
             String newVal = transform(entry.getValue());
             if (newVal != null && newVal != entry.getValue()) {
                 if (newProps == null) {
                     newProps = new HashMap<>();
                     newProps.putAll(props);
                     builder.properties(newProps);
                 }
                 newProps.put(entry.getKey(), newVal);
             }
         }
     }
 
     protected Exclusion transformExclusion(Exclusion target) {
         if (target == null) {
             return null;
         }
         Exclusion.Builder builder = Exclusion.newBuilder(target);
         transformExclusion_GroupId(builder, target);
         transformExclusion_ArtifactId(builder, target);
         return builder.build();
     }
 
     protected void transformExclusion_GroupId(Exclusion.Builder builder, Exclusion target) {
         String newVal = transform(target.getGroupId());
         builder.groupId(newVal != target.getGroupId() ? newVal : null);
     }
     protected void transformExclusion_ArtifactId(Exclusion.Builder builder, Exclusion target) {
         String newVal = transform(target.getArtifactId());
         builder.artifactId(newVal != target.getArtifactId() ? newVal : null);
     }
 
     protected IssueManagement transformIssueManagement(IssueManagement target) {
         if (target == null) {
             return null;
         }
         IssueManagement.Builder builder = IssueManagement.newBuilder(target);
         transformIssueManagement_System(builder, target);
         transformIssueManagement_Url(builder, target);
         return builder.build();
     }
 
     protected void transformIssueManagement_System(IssueManagement.Builder builder, IssueManagement target) {
         String newVal = transform(target.getSystem());
         builder.system(newVal != target.getSystem() ? newVal : null);
     }
     protected void transformIssueManagement_Url(IssueManagement.Builder builder, IssueManagement target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
 
     protected DistributionManagement transformDistributionManagement(DistributionManagement target) {
         if (target == null) {
             return null;
         }
         DistributionManagement.Builder builder = DistributionManagement.newBuilder(target);
         transformDistributionManagement_Repository(builder, target);
         transformDistributionManagement_SnapshotRepository(builder, target);
         transformDistributionManagement_Site(builder, target);
         transformDistributionManagement_DownloadUrl(builder, target);
         transformDistributionManagement_Relocation(builder, target);
         transformDistributionManagement_Status(builder, target);
         return builder.build();
     }
 
     protected void transformDistributionManagement_Repository(DistributionManagement.Builder builder, DistributionManagement target) {
         DeploymentRepository newVal = transformDeploymentRepository(target.getRepository());
         builder.repository(newVal != target.getRepository() ? newVal : null);
     }
     protected void transformDistributionManagement_SnapshotRepository(DistributionManagement.Builder builder, DistributionManagement target) {
         DeploymentRepository newVal = transformDeploymentRepository(target.getSnapshotRepository());
         builder.snapshotRepository(newVal != target.getSnapshotRepository() ? newVal : null);
     }
     protected void transformDistributionManagement_Site(DistributionManagement.Builder builder, DistributionManagement target) {
         Site newVal = transformSite(target.getSite());
         builder.site(newVal != target.getSite() ? newVal : null);
     }
     protected void transformDistributionManagement_DownloadUrl(DistributionManagement.Builder builder, DistributionManagement target) {
         String newVal = transform(target.getDownloadUrl());
         builder.downloadUrl(newVal != target.getDownloadUrl() ? newVal : null);
     }
     protected void transformDistributionManagement_Relocation(DistributionManagement.Builder builder, DistributionManagement target) {
         Relocation newVal = transformRelocation(target.getRelocation());
         builder.relocation(newVal != target.getRelocation() ? newVal : null);
     }
     protected void transformDistributionManagement_Status(DistributionManagement.Builder builder, DistributionManagement target) {
         String newVal = transform(target.getStatus());
         builder.status(newVal != target.getStatus() ? newVal : null);
     }
 
     protected License transformLicense(License target) {
         if (target == null) {
             return null;
         }
         License.Builder builder = License.newBuilder(target);
         transformLicense_Name(builder, target);
         transformLicense_Url(builder, target);
         transformLicense_Distribution(builder, target);
         transformLicense_Comments(builder, target);
         return builder.build();
     }
 
     protected void transformLicense_Name(License.Builder builder, License target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformLicense_Url(License.Builder builder, License target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformLicense_Distribution(License.Builder builder, License target) {
         String newVal = transform(target.getDistribution());
         builder.distribution(newVal != target.getDistribution() ? newVal : null);
     }
     protected void transformLicense_Comments(License.Builder builder, License target) {
         String newVal = transform(target.getComments());
         builder.comments(newVal != target.getComments() ? newVal : null);
     }
 
     protected MailingList transformMailingList(MailingList target) {
         if (target == null) {
             return null;
         }
         MailingList.Builder builder = MailingList.newBuilder(target);
         transformMailingList_Name(builder, target);
         transformMailingList_Subscribe(builder, target);
         transformMailingList_Unsubscribe(builder, target);
         transformMailingList_Post(builder, target);
         transformMailingList_Archive(builder, target);
         transformMailingList_OtherArchives(builder, target);
         return builder.build();
     }
 
     protected void transformMailingList_Name(MailingList.Builder builder, MailingList target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformMailingList_Subscribe(MailingList.Builder builder, MailingList target) {
         String newVal = transform(target.getSubscribe());
         builder.subscribe(newVal != target.getSubscribe() ? newVal : null);
     }
     protected void transformMailingList_Unsubscribe(MailingList.Builder builder, MailingList target) {
         String newVal = transform(target.getUnsubscribe());
         builder.unsubscribe(newVal != target.getUnsubscribe() ? newVal : null);
     }
     protected void transformMailingList_Post(MailingList.Builder builder, MailingList target) {
         String newVal = transform(target.getPost());
         builder.post(newVal != target.getPost() ? newVal : null);
     }
     protected void transformMailingList_Archive(MailingList.Builder builder, MailingList target) {
         String newVal = transform(target.getArchive());
         builder.archive(newVal != target.getArchive() ? newVal : null);
     }
     protected void transformMailingList_OtherArchives(MailingList.Builder builder, MailingList target) {
         builder.otherArchives(transform(target.getOtherArchives(), this::transform));
     }
 
     protected Organization transformOrganization(Organization target) {
         if (target == null) {
             return null;
         }
         Organization.Builder builder = Organization.newBuilder(target);
         transformOrganization_Name(builder, target);
         transformOrganization_Url(builder, target);
         return builder.build();
     }
 
     protected void transformOrganization_Name(Organization.Builder builder, Organization target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformOrganization_Url(Organization.Builder builder, Organization target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
 
     protected PatternSet transformPatternSet(PatternSet target) {
         if (target == null) {
             return null;
         }
         PatternSet.Builder builder = PatternSet.newBuilder(target);
         transformPatternSet_Includes(builder, target);
         transformPatternSet_Excludes(builder, target);
         return builder.build();
     }
 
     protected void transformPatternSet_Includes(PatternSet.Builder builder, PatternSet target) {
         builder.includes(transform(target.getIncludes(), this::transform));
     }
     protected void transformPatternSet_Excludes(PatternSet.Builder builder, PatternSet target) {
         builder.excludes(transform(target.getExcludes(), this::transform));
     }
 
     protected Parent transformParent(Parent target) {
         if (target == null) {
             return null;
         }
         Parent.Builder builder = Parent.newBuilder(target);
         transformParent_GroupId(builder, target);
         transformParent_ArtifactId(builder, target);
         transformParent_Version(builder, target);
         transformParent_RelativePath(builder, target);
         return builder.build();
     }
 
     protected void transformParent_GroupId(Parent.Builder builder, Parent target) {
         String newVal = transform(target.getGroupId());
         builder.groupId(newVal != target.getGroupId() ? newVal : null);
     }
     protected void transformParent_ArtifactId(Parent.Builder builder, Parent target) {
         String newVal = transform(target.getArtifactId());
         builder.artifactId(newVal != target.getArtifactId() ? newVal : null);
     }
     protected void transformParent_Version(Parent.Builder builder, Parent target) {
         String newVal = transform(target.getVersion());
         builder.version(newVal != target.getVersion() ? newVal : null);
     }
     protected void transformParent_RelativePath(Parent.Builder builder, Parent target) {
         String newVal = transform(target.getRelativePath());
         builder.relativePath(newVal != target.getRelativePath() ? newVal : null);
     }
 
     protected Scm transformScm(Scm target) {
         if (target == null) {
             return null;
         }
         Scm.Builder builder = Scm.newBuilder(target);
         transformScm_Connection(builder, target);
         transformScm_DeveloperConnection(builder, target);
         transformScm_Tag(builder, target);
         transformScm_Url(builder, target);
         transformScm_ChildScmConnectionInheritAppendPath(builder, target);
         transformScm_ChildScmDeveloperConnectionInheritAppendPath(builder, target);
         transformScm_ChildScmUrlInheritAppendPath(builder, target);
         return builder.build();
     }
 
     protected void transformScm_Connection(Scm.Builder builder, Scm target) {
         String newVal = transform(target.getConnection());
         builder.connection(newVal != target.getConnection() ? newVal : null);
     }
     protected void transformScm_DeveloperConnection(Scm.Builder builder, Scm target) {
         String newVal = transform(target.getDeveloperConnection());
         builder.developerConnection(newVal != target.getDeveloperConnection() ? newVal : null);
     }
     protected void transformScm_Tag(Scm.Builder builder, Scm target) {
         String newVal = transform(target.getTag());
         builder.tag(newVal != target.getTag() ? newVal : null);
     }
     protected void transformScm_Url(Scm.Builder builder, Scm target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformScm_ChildScmConnectionInheritAppendPath(Scm.Builder builder, Scm target) {
         String newVal = transform(target.getChildScmConnectionInheritAppendPath());
         builder.childScmConnectionInheritAppendPath(newVal != target.getChildScmConnectionInheritAppendPath() ? newVal : null);
     }
     protected void transformScm_ChildScmDeveloperConnectionInheritAppendPath(Scm.Builder builder, Scm target) {
         String newVal = transform(target.getChildScmDeveloperConnectionInheritAppendPath());
         builder.childScmDeveloperConnectionInheritAppendPath(newVal != target.getChildScmDeveloperConnectionInheritAppendPath() ? newVal : null);
     }
     protected void transformScm_ChildScmUrlInheritAppendPath(Scm.Builder builder, Scm target) {
         String newVal = transform(target.getChildScmUrlInheritAppendPath());
         builder.childScmUrlInheritAppendPath(newVal != target.getChildScmUrlInheritAppendPath() ? newVal : null);
     }
 
     protected FileSet transformFileSet(FileSet target) {
         if (target == null) {
             return null;
         }
         FileSet.Builder builder = FileSet.newBuilder(target);
         transformFileSet_Directory(builder, target);
         transformPatternSet_Includes(builder, target);
         transformPatternSet_Excludes(builder, target);
         return builder.build();
     }
 
     protected void transformFileSet_Directory(FileSet.Builder builder, FileSet target) {
         String newVal = transform(target.getDirectory());
         builder.directory(newVal != target.getDirectory() ? newVal : null);
     }
     protected void transformFileSet_Includes(FileSet.Builder builder, FileSet target) {
         builder.includes(transform(target.getIncludes(), this::transform));
     }
     protected void transformFileSet_Excludes(FileSet.Builder builder, FileSet target) {
         builder.excludes(transform(target.getExcludes(), this::transform));
     }
 
     protected Resource transformResource(Resource target) {
         if (target == null) {
             return null;
         }
         Resource.Builder builder = Resource.newBuilder(target);
         transformResource_TargetPath(builder, target);
         transformResource_Filtering(builder, target);
         transformFileSet_Directory(builder, target);
         transformPatternSet_Includes(builder, target);
         transformPatternSet_Excludes(builder, target);
         return builder.build();
     }
 
     protected void transformResource_TargetPath(Resource.Builder builder, Resource target) {
         String newVal = transform(target.getTargetPath());
         builder.targetPath(newVal != target.getTargetPath() ? newVal : null);
     }
     protected void transformResource_Filtering(Resource.Builder builder, Resource target) {
         String newVal = transform(target.getFiltering());
         builder.filtering(newVal != target.getFiltering() ? newVal : null);
     }
     protected void transformResource_Directory(Resource.Builder builder, Resource target) {
         String newVal = transform(target.getDirectory());
         builder.directory(newVal != target.getDirectory() ? newVal : null);
     }
     protected void transformResource_Includes(Resource.Builder builder, Resource target) {
         builder.includes(transform(target.getIncludes(), this::transform));
     }
     protected void transformResource_Excludes(Resource.Builder builder, Resource target) {
         builder.excludes(transform(target.getExcludes(), this::transform));
     }
 
     protected RepositoryBase transformRepositoryBase(RepositoryBase target) {
         if (target == null) {
             return null;
         }
         RepositoryBase.Builder builder = RepositoryBase.newBuilder(target);
         transformRepositoryBase_Id(builder, target);
         transformRepositoryBase_Name(builder, target);
         transformRepositoryBase_Url(builder, target);
         transformRepositoryBase_Layout(builder, target);
         return builder.build();
     }
 
     protected void transformRepositoryBase_Id(RepositoryBase.Builder builder, RepositoryBase target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
     protected void transformRepositoryBase_Name(RepositoryBase.Builder builder, RepositoryBase target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformRepositoryBase_Url(RepositoryBase.Builder builder, RepositoryBase target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformRepositoryBase_Layout(RepositoryBase.Builder builder, RepositoryBase target) {
         String newVal = transform(target.getLayout());
         builder.layout(newVal != target.getLayout() ? newVal : null);
     }
 
     protected Repository transformRepository(Repository target) {
         if (target == null) {
             return null;
         }
         Repository.Builder builder = Repository.newBuilder(target);
         transformRepository_Releases(builder, target);
         transformRepository_Snapshots(builder, target);
         transformRepositoryBase_Id(builder, target);
         transformRepositoryBase_Name(builder, target);
         transformRepositoryBase_Url(builder, target);
         transformRepositoryBase_Layout(builder, target);
         return builder.build();
     }
 
     protected void transformRepository_Releases(Repository.Builder builder, Repository target) {
         RepositoryPolicy newVal = transformRepositoryPolicy(target.getReleases());
         builder.releases(newVal != target.getReleases() ? newVal : null);
     }
     protected void transformRepository_Snapshots(Repository.Builder builder, Repository target) {
         RepositoryPolicy newVal = transformRepositoryPolicy(target.getSnapshots());
         builder.snapshots(newVal != target.getSnapshots() ? newVal : null);
     }
     protected void transformRepository_Id(Repository.Builder builder, Repository target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
     protected void transformRepository_Name(Repository.Builder builder, Repository target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformRepository_Url(Repository.Builder builder, Repository target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformRepository_Layout(Repository.Builder builder, Repository target) {
         String newVal = transform(target.getLayout());
         builder.layout(newVal != target.getLayout() ? newVal : null);
     }
 
     protected DeploymentRepository transformDeploymentRepository(DeploymentRepository target) {
         if (target == null) {
             return null;
         }
         DeploymentRepository.Builder builder = DeploymentRepository.newBuilder(target);
         transformDeploymentRepository_UniqueVersion(builder, target);
         transformRepository_Releases(builder, target);
         transformRepository_Snapshots(builder, target);
         transformRepositoryBase_Id(builder, target);
         transformRepositoryBase_Name(builder, target);
         transformRepositoryBase_Url(builder, target);
         transformRepositoryBase_Layout(builder, target);
         return builder.build();
     }
 
     protected void transformDeploymentRepository_UniqueVersion(DeploymentRepository.Builder builder, DeploymentRepository target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformDeploymentRepository_Releases(DeploymentRepository.Builder builder, DeploymentRepository target) {
         RepositoryPolicy newVal = transformRepositoryPolicy(target.getReleases());
         builder.releases(newVal != target.getReleases() ? newVal : null);
     }
     protected void transformDeploymentRepository_Snapshots(DeploymentRepository.Builder builder, DeploymentRepository target) {
         RepositoryPolicy newVal = transformRepositoryPolicy(target.getSnapshots());
         builder.snapshots(newVal != target.getSnapshots() ? newVal : null);
     }
     protected void transformDeploymentRepository_Id(DeploymentRepository.Builder builder, DeploymentRepository target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
     protected void transformDeploymentRepository_Name(DeploymentRepository.Builder builder, DeploymentRepository target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformDeploymentRepository_Url(DeploymentRepository.Builder builder, DeploymentRepository target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformDeploymentRepository_Layout(DeploymentRepository.Builder builder, DeploymentRepository target) {
         String newVal = transform(target.getLayout());
         builder.layout(newVal != target.getLayout() ? newVal : null);
     }
 
     protected RepositoryPolicy transformRepositoryPolicy(RepositoryPolicy target) {
         if (target == null) {
             return null;
         }
         RepositoryPolicy.Builder builder = RepositoryPolicy.newBuilder(target);
         transformRepositoryPolicy_Enabled(builder, target);
         transformRepositoryPolicy_UpdatePolicy(builder, target);
         transformRepositoryPolicy_ChecksumPolicy(builder, target);
         return builder.build();
     }
 
     protected void transformRepositoryPolicy_Enabled(RepositoryPolicy.Builder builder, RepositoryPolicy target) {
         String newVal = transform(target.getEnabled());
         builder.enabled(newVal != target.getEnabled() ? newVal : null);
     }
     protected void transformRepositoryPolicy_UpdatePolicy(RepositoryPolicy.Builder builder, RepositoryPolicy target) {
         String newVal = transform(target.getUpdatePolicy());
         builder.updatePolicy(newVal != target.getUpdatePolicy() ? newVal : null);
     }
     protected void transformRepositoryPolicy_ChecksumPolicy(RepositoryPolicy.Builder builder, RepositoryPolicy target) {
         String newVal = transform(target.getChecksumPolicy());
         builder.checksumPolicy(newVal != target.getChecksumPolicy() ? newVal : null);
     }
 
     protected Site transformSite(Site target) {
         if (target == null) {
             return null;
         }
         Site.Builder builder = Site.newBuilder(target);
         transformSite_Id(builder, target);
         transformSite_Name(builder, target);
         transformSite_Url(builder, target);
         transformSite_ChildSiteUrlInheritAppendPath(builder, target);
         return builder.build();
     }
 
     protected void transformSite_Id(Site.Builder builder, Site target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
     protected void transformSite_Name(Site.Builder builder, Site target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformSite_Url(Site.Builder builder, Site target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformSite_ChildSiteUrlInheritAppendPath(Site.Builder builder, Site target) {
         String newVal = transform(target.getChildSiteUrlInheritAppendPath());
         builder.childSiteUrlInheritAppendPath(newVal != target.getChildSiteUrlInheritAppendPath() ? newVal : null);
     }
 
     protected ConfigurationContainer transformConfigurationContainer(ConfigurationContainer target) {
         if (target == null) {
             return null;
         }
         ConfigurationContainer.Builder builder = ConfigurationContainer.newBuilder(target);
         transformConfigurationContainer_Inherited(builder, target);
         transformConfigurationContainer_Configuration(builder, target);
         return builder.build();
     }
 
     protected void transformConfigurationContainer_Inherited(ConfigurationContainer.Builder builder, ConfigurationContainer target) {
         String newVal = transform(target.getInherited());
         builder.inherited(newVal != target.getInherited() ? newVal : null);
     }
     protected void transformConfigurationContainer_Configuration(ConfigurationContainer.Builder builder, ConfigurationContainer target) {
         XmlNode newVal = transform(target.getConfiguration());
         builder.configuration(newVal != target.getConfiguration() ? newVal : null);
     }
 
     protected Plugin transformPlugin(Plugin target) {
         if (target == null) {
             return null;
         }
         Plugin.Builder builder = Plugin.newBuilder(target);
         transformPlugin_GroupId(builder, target);
         transformPlugin_ArtifactId(builder, target);
         transformPlugin_Version(builder, target);
         transformPlugin_Extensions(builder, target);
         transformPlugin_Executions(builder, target);
         transformPlugin_Dependencies(builder, target);
         transformConfigurationContainer_Inherited(builder, target);
         transformConfigurationContainer_Configuration(builder, target);
         return builder.build();
     }
 
     protected void transformPlugin_GroupId(Plugin.Builder builder, Plugin target) {
         String newVal = transform(target.getGroupId());
         builder.groupId(newVal != target.getGroupId() ? newVal : null);
     }
     protected void transformPlugin_ArtifactId(Plugin.Builder builder, Plugin target) {
         String newVal = transform(target.getArtifactId());
         builder.artifactId(newVal != target.getArtifactId() ? newVal : null);
     }
     protected void transformPlugin_Version(Plugin.Builder builder, Plugin target) {
         String newVal = transform(target.getVersion());
         builder.version(newVal != target.getVersion() ? newVal : null);
     }
     protected void transformPlugin_Extensions(Plugin.Builder builder, Plugin target) {
         String newVal = transform(target.getExtensions());
         builder.extensions(newVal != target.getExtensions() ? newVal : null);
     }
     protected void transformPlugin_Executions(Plugin.Builder builder, Plugin target) {
         builder.executions(transform(target.getExecutions(), this::transformPluginExecution));
     }
     protected void transformPlugin_Dependencies(Plugin.Builder builder, Plugin target) {
         builder.dependencies(transform(target.getDependencies(), this::transformDependency));
     }
     protected void transformPlugin_Inherited(Plugin.Builder builder, Plugin target) {
         String newVal = transform(target.getInherited());
         builder.inherited(newVal != target.getInherited() ? newVal : null);
     }
     protected void transformPlugin_Configuration(Plugin.Builder builder, Plugin target) {
         XmlNode newVal = transform(target.getConfiguration());
         builder.configuration(newVal != target.getConfiguration() ? newVal : null);
     }
 
     protected PluginExecution transformPluginExecution(PluginExecution target) {
         if (target == null) {
             return null;
         }
         PluginExecution.Builder builder = PluginExecution.newBuilder(target);
         transformPluginExecution_Id(builder, target);
         transformPluginExecution_Phase(builder, target);
         transformPluginExecution_Priority(builder, target);
         transformPluginExecution_Goals(builder, target);
         transformConfigurationContainer_Inherited(builder, target);
         transformConfigurationContainer_Configuration(builder, target);
         return builder.build();
     }
 
     protected void transformPluginExecution_Id(PluginExecution.Builder builder, PluginExecution target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
     protected void transformPluginExecution_Phase(PluginExecution.Builder builder, PluginExecution target) {
         String newVal = transform(target.getPhase());
         builder.phase(newVal != target.getPhase() ? newVal : null);
     }
     protected void transformPluginExecution_Priority(PluginExecution.Builder builder, PluginExecution target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformPluginExecution_Goals(PluginExecution.Builder builder, PluginExecution target) {
         builder.goals(transform(target.getGoals(), this::transform));
     }
     protected void transformPluginExecution_Inherited(PluginExecution.Builder builder, PluginExecution target) {
         String newVal = transform(target.getInherited());
         builder.inherited(newVal != target.getInherited() ? newVal : null);
     }
     protected void transformPluginExecution_Configuration(PluginExecution.Builder builder, PluginExecution target) {
         XmlNode newVal = transform(target.getConfiguration());
         builder.configuration(newVal != target.getConfiguration() ? newVal : null);
     }
 
     protected DependencyManagement transformDependencyManagement(DependencyManagement target) {
         if (target == null) {
             return null;
         }
         DependencyManagement.Builder builder = DependencyManagement.newBuilder(target);
         transformDependencyManagement_Dependencies(builder, target);
         return builder.build();
     }
 
     protected void transformDependencyManagement_Dependencies(DependencyManagement.Builder builder, DependencyManagement target) {
         builder.dependencies(transform(target.getDependencies(), this::transformDependency));
     }
 
     protected PluginManagement transformPluginManagement(PluginManagement target) {
         if (target == null) {
             return null;
         }
         PluginManagement.Builder builder = PluginManagement.newBuilder(target);
         transformPluginContainer_Plugins(builder, target);
         return builder.build();
     }
 
     protected void transformPluginManagement_Plugins(PluginManagement.Builder builder, PluginManagement target) {
         builder.plugins(transform(target.getPlugins(), this::transformPlugin));
     }
 
     protected Reporting transformReporting(Reporting target) {
         if (target == null) {
             return null;
         }
         Reporting.Builder builder = Reporting.newBuilder(target);
         transformReporting_ExcludeDefaults(builder, target);
         transformReporting_OutputDirectory(builder, target);
         transformReporting_Plugins(builder, target);
         return builder.build();
     }
 
     protected void transformReporting_ExcludeDefaults(Reporting.Builder builder, Reporting target) {
         String newVal = transform(target.getExcludeDefaults());
         builder.excludeDefaults(newVal != target.getExcludeDefaults() ? newVal : null);
     }
     protected void transformReporting_OutputDirectory(Reporting.Builder builder, Reporting target) {
         String newVal = transform(target.getOutputDirectory());
         builder.outputDirectory(newVal != target.getOutputDirectory() ? newVal : null);
     }
     protected void transformReporting_Plugins(Reporting.Builder builder, Reporting target) {
         builder.plugins(transform(target.getPlugins(), this::transformReportPlugin));
     }
 
     protected Profile transformProfile(Profile target) {
         if (target == null) {
             return null;
         }
         Profile.Builder builder = Profile.newBuilder(target);
         transformProfile_Id(builder, target);
         transformProfile_Activation(builder, target);
         transformProfile_Build(builder, target);
         transformModelBase_Modules(builder, target);
         transformModelBase_DistributionManagement(builder, target);
         transformModelBase_Properties(builder, target);
         transformModelBase_DependencyManagement(builder, target);
         transformModelBase_Dependencies(builder, target);
         transformModelBase_Repositories(builder, target);
         transformModelBase_PluginRepositories(builder, target);
         transformModelBase_Reporting(builder, target);
         return builder.build();
     }
 
     protected void transformProfile_Id(Profile.Builder builder, Profile target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
     protected void transformProfile_Activation(Profile.Builder builder, Profile target) {
         Activation newVal = transformActivation(target.getActivation());
         builder.activation(newVal != target.getActivation() ? newVal : null);
     }
     protected void transformProfile_Build(Profile.Builder builder, Profile target) {
         BuildBase newVal = transformBuildBase(target.getBuild());
         builder.build(newVal != target.getBuild() ? newVal : null);
     }
     protected void transformProfile_Modules(Profile.Builder builder, Profile target) {
         builder.modules(transform(target.getModules(), this::transform));
     }
     protected void transformProfile_DistributionManagement(Profile.Builder builder, Profile target) {
         DistributionManagement newVal = transformDistributionManagement(target.getDistributionManagement());
         builder.distributionManagement(newVal != target.getDistributionManagement() ? newVal : null);
     }
     protected void transformProfile_Properties(Profile.Builder builder, Profile target) {
         Map<String, String> props = target.getProperties();
         Map<String, String> newProps = null;
         for (Map.Entry<String, String> entry : props.entrySet()) {
             String newVal = transform(entry.getValue());
             if (newVal != null && newVal != entry.getValue()) {
                 if (newProps == null) {
                     newProps = new HashMap<>();
                     newProps.putAll(props);
                     builder.properties(newProps);
                 }
                 newProps.put(entry.getKey(), newVal);
             }
         }
     }
     protected void transformProfile_DependencyManagement(Profile.Builder builder, Profile target) {
         DependencyManagement newVal = transformDependencyManagement(target.getDependencyManagement());
         builder.dependencyManagement(newVal != target.getDependencyManagement() ? newVal : null);
     }
     protected void transformProfile_Dependencies(Profile.Builder builder, Profile target) {
         builder.dependencies(transform(target.getDependencies(), this::transformDependency));
     }
     protected void transformProfile_Repositories(Profile.Builder builder, Profile target) {
         builder.repositories(transform(target.getRepositories(), this::transformRepository));
     }
     protected void transformProfile_PluginRepositories(Profile.Builder builder, Profile target) {
         builder.pluginRepositories(transform(target.getPluginRepositories(), this::transformRepository));
     }
     protected void transformProfile_Reporting(Profile.Builder builder, Profile target) {
         Reporting newVal = transformReporting(target.getReporting());
         builder.reporting(newVal != target.getReporting() ? newVal : null);
     }
 
     protected Activation transformActivation(Activation target) {
         if (target == null) {
             return null;
         }
         Activation.Builder builder = Activation.newBuilder(target);
         transformActivation_ActiveByDefault(builder, target);
         transformActivation_Jdk(builder, target);
         transformActivation_Os(builder, target);
         transformActivation_Property(builder, target);
         transformActivation_File(builder, target);
         return builder.build();
     }
 
     protected void transformActivation_ActiveByDefault(Activation.Builder builder, Activation target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformActivation_Jdk(Activation.Builder builder, Activation target) {
         String newVal = transform(target.getJdk());
         builder.jdk(newVal != target.getJdk() ? newVal : null);
     }
     protected void transformActivation_Os(Activation.Builder builder, Activation target) {
         ActivationOS newVal = transformActivationOS(target.getOs());
         builder.os(newVal != target.getOs() ? newVal : null);
     }
     protected void transformActivation_Property(Activation.Builder builder, Activation target) {
         ActivationProperty newVal = transformActivationProperty(target.getProperty());
         builder.property(newVal != target.getProperty() ? newVal : null);
     }
     protected void transformActivation_File(Activation.Builder builder, Activation target) {
         ActivationFile newVal = transformActivationFile(target.getFile());
         builder.file(newVal != target.getFile() ? newVal : null);
     }
 
     protected ActivationProperty transformActivationProperty(ActivationProperty target) {
         if (target == null) {
             return null;
         }
         ActivationProperty.Builder builder = ActivationProperty.newBuilder(target);
         transformActivationProperty_Name(builder, target);
         transformActivationProperty_Value(builder, target);
         return builder.build();
     }
 
     protected void transformActivationProperty_Name(ActivationProperty.Builder builder, ActivationProperty target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformActivationProperty_Value(ActivationProperty.Builder builder, ActivationProperty target) {
         String newVal = transform(target.getValue());
         builder.value(newVal != target.getValue() ? newVal : null);
     }
 
     protected ActivationOS transformActivationOS(ActivationOS target) {
         if (target == null) {
             return null;
         }
         ActivationOS.Builder builder = ActivationOS.newBuilder(target);
         transformActivationOS_Name(builder, target);
         transformActivationOS_Family(builder, target);
         transformActivationOS_Arch(builder, target);
         transformActivationOS_Version(builder, target);
         return builder.build();
     }
 
     protected void transformActivationOS_Name(ActivationOS.Builder builder, ActivationOS target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformActivationOS_Family(ActivationOS.Builder builder, ActivationOS target) {
         String newVal = transform(target.getFamily());
         builder.family(newVal != target.getFamily() ? newVal : null);
     }
     protected void transformActivationOS_Arch(ActivationOS.Builder builder, ActivationOS target) {
         String newVal = transform(target.getArch());
         builder.arch(newVal != target.getArch() ? newVal : null);
     }
     protected void transformActivationOS_Version(ActivationOS.Builder builder, ActivationOS target) {
         String newVal = transform(target.getVersion());
         builder.version(newVal != target.getVersion() ? newVal : null);
     }
 
     protected ActivationFile transformActivationFile(ActivationFile target) {
         if (target == null) {
             return null;
         }
         ActivationFile.Builder builder = ActivationFile.newBuilder(target);
         transformActivationFile_Missing(builder, target);
         transformActivationFile_Exists(builder, target);
         return builder.build();
     }
 
     protected void transformActivationFile_Missing(ActivationFile.Builder builder, ActivationFile target) {
         String newVal = transform(target.getMissing());
         builder.missing(newVal != target.getMissing() ? newVal : null);
     }
     protected void transformActivationFile_Exists(ActivationFile.Builder builder, ActivationFile target) {
         String newVal = transform(target.getExists());
         builder.exists(newVal != target.getExists() ? newVal : null);
     }
 
     protected ReportPlugin transformReportPlugin(ReportPlugin target) {
         if (target == null) {
             return null;
         }
         ReportPlugin.Builder builder = ReportPlugin.newBuilder(target);
         transformReportPlugin_GroupId(builder, target);
         transformReportPlugin_ArtifactId(builder, target);
         transformReportPlugin_Version(builder, target);
         transformReportPlugin_ReportSets(builder, target);
         transformConfigurationContainer_Inherited(builder, target);
         transformConfigurationContainer_Configuration(builder, target);
         return builder.build();
     }
 
     protected void transformReportPlugin_GroupId(ReportPlugin.Builder builder, ReportPlugin target) {
         String newVal = transform(target.getGroupId());
         builder.groupId(newVal != target.getGroupId() ? newVal : null);
     }
     protected void transformReportPlugin_ArtifactId(ReportPlugin.Builder builder, ReportPlugin target) {
         String newVal = transform(target.getArtifactId());
         builder.artifactId(newVal != target.getArtifactId() ? newVal : null);
     }
     protected void transformReportPlugin_Version(ReportPlugin.Builder builder, ReportPlugin target) {
         String newVal = transform(target.getVersion());
         builder.version(newVal != target.getVersion() ? newVal : null);
     }
     protected void transformReportPlugin_ReportSets(ReportPlugin.Builder builder, ReportPlugin target) {
         builder.reportSets(transform(target.getReportSets(), this::transformReportSet));
     }
     protected void transformReportPlugin_Inherited(ReportPlugin.Builder builder, ReportPlugin target) {
         String newVal = transform(target.getInherited());
         builder.inherited(newVal != target.getInherited() ? newVal : null);
     }
     protected void transformReportPlugin_Configuration(ReportPlugin.Builder builder, ReportPlugin target) {
         XmlNode newVal = transform(target.getConfiguration());
         builder.configuration(newVal != target.getConfiguration() ? newVal : null);
     }
 
     protected ReportSet transformReportSet(ReportSet target) {
         if (target == null) {
             return null;
         }
         ReportSet.Builder builder = ReportSet.newBuilder(target);
         transformReportSet_Id(builder, target);
         transformReportSet_Reports(builder, target);
         transformConfigurationContainer_Inherited(builder, target);
         transformConfigurationContainer_Configuration(builder, target);
         return builder.build();
     }
 
     protected void transformReportSet_Id(ReportSet.Builder builder, ReportSet target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
     protected void transformReportSet_Reports(ReportSet.Builder builder, ReportSet target) {
         builder.reports(transform(target.getReports(), this::transform));
     }
     protected void transformReportSet_Inherited(ReportSet.Builder builder, ReportSet target) {
         String newVal = transform(target.getInherited());
         builder.inherited(newVal != target.getInherited() ? newVal : null);
     }
     protected void transformReportSet_Configuration(ReportSet.Builder builder, ReportSet target) {
         XmlNode newVal = transform(target.getConfiguration());
         builder.configuration(newVal != target.getConfiguration() ? newVal : null);
     }
 
     protected Prerequisites transformPrerequisites(Prerequisites target) {
         if (target == null) {
             return null;
         }
         Prerequisites.Builder builder = Prerequisites.newBuilder(target);
         transformPrerequisites_Maven(builder, target);
         return builder.build();
     }
 
     protected void transformPrerequisites_Maven(Prerequisites.Builder builder, Prerequisites target) {
         String newVal = transform(target.getMaven());
         builder.maven(newVal != target.getMaven() ? newVal : null);
     }
 
     protected Relocation transformRelocation(Relocation target) {
         if (target == null) {
             return null;
         }
         Relocation.Builder builder = Relocation.newBuilder(target);
         transformRelocation_GroupId(builder, target);
         transformRelocation_ArtifactId(builder, target);
         transformRelocation_Version(builder, target);
         transformRelocation_Message(builder, target);
         return builder.build();
     }
 
     protected void transformRelocation_GroupId(Relocation.Builder builder, Relocation target) {
         String newVal = transform(target.getGroupId());
         builder.groupId(newVal != target.getGroupId() ? newVal : null);
     }
     protected void transformRelocation_ArtifactId(Relocation.Builder builder, Relocation target) {
         String newVal = transform(target.getArtifactId());
         builder.artifactId(newVal != target.getArtifactId() ? newVal : null);
     }
     protected void transformRelocation_Version(Relocation.Builder builder, Relocation target) {
         String newVal = transform(target.getVersion());
         builder.version(newVal != target.getVersion() ? newVal : null);
     }
     protected void transformRelocation_Message(Relocation.Builder builder, Relocation target) {
         String newVal = transform(target.getMessage());
         builder.message(newVal != target.getMessage() ? newVal : null);
     }
 
     protected Extension transformExtension(Extension target) {
         if (target == null) {
             return null;
         }
         Extension.Builder builder = Extension.newBuilder(target);
         transformExtension_GroupId(builder, target);
         transformExtension_ArtifactId(builder, target);
         transformExtension_Version(builder, target);
         transformExtension_Configuration(builder, target);
         return builder.build();
     }
 
     protected void transformExtension_GroupId(Extension.Builder builder, Extension target) {
         String newVal = transform(target.getGroupId());
         builder.groupId(newVal != target.getGroupId() ? newVal : null);
     }
     protected void transformExtension_ArtifactId(Extension.Builder builder, Extension target) {
         String newVal = transform(target.getArtifactId());
         builder.artifactId(newVal != target.getArtifactId() ? newVal : null);
     }
     protected void transformExtension_Version(Extension.Builder builder, Extension target) {
         String newVal = transform(target.getVersion());
         builder.version(newVal != target.getVersion() ? newVal : null);
     }
     protected void transformExtension_Configuration(Extension.Builder builder, Extension target) {
         XmlNode newVal = transform(target.getConfiguration());
         builder.configuration(newVal != target.getConfiguration() ? newVal : null);
     }
 
     protected <T> List<T> transform(List<T> list, Function<T, T> transformer) {
         List<T> newList = null;
         for (int i = 0; i < list.size(); i++) {
             T newVal = transformer.apply(list.get(i));
             if (newVal != list.get(i)) {
                 if (newList == null) {
                     newList = new ArrayList<>(list);
                 }
                 newList.set(i, newVal);
             }
         }
         return newList;
     }
 
     protected XmlNode transform(XmlNode node) {
         if (node != null) {
             Xpp3Dom xpp = new Xpp3Dom(node);
             transform(xpp);
             return xpp.getDom();
         }
         return node;
     }
 
     protected void transform(Xpp3Dom dom) {
         if (dom != null) {
             String org, val;
             // Content
             org = dom.getValue();
             val = transform(org);
             if (org != val) {
                 dom.setValue(val);
             }
             // Attributes
             for (String attr : dom.getAttributeNames()) {
                 org = dom.getAttribute(attr);
                 val = transform(org);
                 if (org != val) {
                     dom.setAttribute(attr, val);
                 }
             }
             // Children
             for (int i = 0, l = dom.getChildCount(); i < l; i++) {
                 transform(dom.getChild(i));
             }
         }
     }
 }