<groupId>gid</groupId>
  <artifactId>aid</artifactId>
  <version>1.0</version>
  <packaging>pom</packaging>
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.modello</groupId>
        <artifactId>modello-maven-plugin</artifactId>
        <version>1.0-alpha-21</version>
      </plugin>
    </plugins>
  </build>

    <artifactId>aid</artifactId>
  <version>1.0</version>
  <packaging>pom</packaging>
  <build>
    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.codehaus.modello</groupId>
          <artifactId>modello-maven-plugin</artifactId>
          <version>1.0-alpha-21</version>
          <dependencies>
            <dependency>
              <groupId>a</groupId>
              <artifactId>b</artifactId>

              <velocityBasedir>${project.basedir}/../../src/mdo</velocityBasedir>
              <version>1.2.0</version>
              <models>
                <model>src/main/mdo/metadata.mdo</model>
              </models>
              <templates>
                <template>model.vm</template>
              </templates>
              <params>
                <param>packageModelV4=org.apache.maven.api.metadata</param>

              <models>
                <model>src/main/mdo/maven.mdo</model>
              </models>
              <templates>
                <template>model.vm</template>
              </templates>
              <params>
                <param>packageModelV4=org.apache.maven.api.model</param>
                <param>isMavenModel=true</param>
              </params>

              <models>
                <model>src/main/mdo/maven.mdo</model>
              </models>
              <templates>
                <template>merger.vm</template>
                <template>transformer.vm</template>
                <template>reader-stax.vm</template>
                <template>writer-stax.vm</template>
                <template>model-version.vm</template>
              </templates>
              <params>

    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.modello</groupId>
        <artifactId>modello-maven-plugin</artifactId>
        <version>1.0-alpha-17</version>
        <configuration>
          <version>1.0.0</version>
          <model>src/main/mdo/metadata.mdo</model>
        </configuration>
        <executions>
          <execution>
            <id>site-docs</id>

     *
     * @param model The model whose duplicate elements should be merged, must not be {@code null}.
     * @param request The model building request that holds further settings, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */

        </parameter>
      </parameters>

- we need to know what came from the POM, and validate those
- plugin in any default values
- check to see if anything is missing

        this.problems.addAll(result.getProblems());

        for (String modelId : result.getModelIds()) {
            this.modelIds.add(modelId);
            this.rawModels.put(modelId, result.getRawModel(modelId).orElseThrow());
            this.activePomProfiles.put(modelId, result.getActivePomProfiles(modelId));
        }
    }

    @Override
    public Model getFileModel() {
        return fileModel;
    }

        public XmlReaderRequestBuilder strict(boolean strict) {
            this.strict = strict;
            return this;
        }

        public XmlReaderRequestBuilder modelId(String modelId) {
            this.modelId = modelId;
            return this;
        }

        public XmlReaderRequestBuilder location(String location) {
            this.location = location;
            return this;
        }