maven-embedder/src/main/mdo/core-extensions.mdo

<?xml version="1.0" encoding="UTF-8"?>

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<model xmlns="http://codehaus-plexus.github.io/MODELLO/1.4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://codehaus-plexus.github.io/MODELLO/1.4.0 http://codehaus-plexus.github.io/modello/xsd/modello-1.4.0.xsd"
  xml.namespace="http://maven.apache.org/EXTENSIONS/${version}"
  xml.schemaLocation="http://maven.apache.org/xsd/core-extensions-${version}.xsd">

  <id>core-extensions</id>
  <name>CoreExtensions</name>
  <description><![CDATA[
  <p>This is a reference for the Core Extensions descriptor.</p>
  <p>The default location for the Core Extensions descriptor file is <code>${maven.projectBasedir}/.mvn/extensions.xml</code></p>
  ]]></description>

  <defaults>
    <default>
      <key>package</key>
      <value>org.apache.maven.cli.internal.extension.model</value>
    </default>
  </defaults>

  <classes>
    <class rootElement="true" xml.tagName="extensions" xsd.compositor="sequence">
      <name>CoreExtensions</name>
      <description>Extensions to load.</description>
      <version>1.0.0+</version>
      <fields>
        <field>
          <name>extensions</name>
          <description>A set of build extensions to use from this project.</description>
          <version>1.0.0+</version>
          <association xml.itemsStyle="flat">
            <type>CoreExtension</type>
            <multiplicity>*</multiplicity>
          </association>
        </field>
      </fields>
    </class>
    <class xml.tagName="extension">
      <name>CoreExtension</name>
      <description>Describes a build extension to utilise.</description>
      <version>1.0.0+</version>
      <fields>
        <field>
          <name>groupId</name>
          <description>The group ID of the extension's artifact.</description>
          <version>1.0.0+</version>
          <required>true</required>
          <type>String</type>
        </field>
        <field>
          <name>artifactId</name>
          <description>The artifact ID of the extension.</description>
          <version>1.0.0+</version>
          <required>true</required>
          <type>String</type>
        </field>
        <field>
          <name>version</name>
          <description>The version of the extension.</description>
          <version>1.0.0+</version>
          <required>true</required>
          <type>String</type>
        </field>
      </fields>
      <codeSegments>
        <codeSegment>
          <version>1.0.0+</version>
          <code>
            <![CDATA[
    /**
     * Gets the identifier of the extension.
     *
     * @return The extension id in the form {@code <groupId>:<artifactId>:<version>}, never {@code null}.
     */
    public String getId()
    {
        StringBuilder id = new StringBuilder( 128 );

        id.append( ( getGroupId() == null ) ? "[unknown-group-id]" : getGroupId() );
        id.append( ":" );
        id.append( ( getArtifactId() == null ) ? "[unknown-artifact-id]" : getArtifactId() );
        id.append( ":" );
        id.append( ( getVersion() == null ) ? "[unknown-version]" : getVersion() );

        return id.toString();
    }
            ]]>
          </code>
        </codeSegment>
      </codeSegments>
    </class>
  </classes>
</model>