Plugins can state compile-time dependencies on any of the resources found in
 the core realms listed above and these dependencies will be included in the
 plugin descriptor that is generated but when running within Maven these
 resources will be filtered out. In other words these resources will not
 be added the realm created for the plugins execution as they are provided

            <!-- NOTE: These values are deliberately not in alpha order! -->
            <stringParam>CHILD-1</stringParam>
            <stringParam>CHILD-3</stringParam>
            <stringParam>CHILD-2</stringParam>
            <stringParam>CHILD-4</stringParam>
          </stringParams>
          <listParam combine.children="append">
            <!-- NOTE: These values are deliberately not in alpha order! -->

These particular phases in a plugin’s lifecycle can probably be generalized to all plugins so could be something implemented in all plugins. Here we could have the descriptor either point to methods for each of these phases to execute or we could create a lifecycle in Plexus for these phases.

For a particular application plugin there will be a declarative descriptor for that plugin type.

/**
 * Do not use!
 * <p>
 * Should only be implemented by DebugResolutionListener.  Remove this
 * when the ResolutionListener interface deprecation of the manageArtifact
 * method (and the [yet to be done] addition of these methods to that
 * interface) has had a chance to propagate to all interested plugins.
 */
@Deprecated
public interface ResolutionListenerForDepMgmt {
    void manageArtifactVersion(Artifact artifact, Artifact replacement);

        return result;
    }

    /**
     * Gets the identifier of the POM whose effective model could not be built. The general format of the identifier is
     * {@code <groupId>:<artifactId>:<version>} but some of these coordinates may still be unknown at the point the
     * exception is thrown so this information is merely meant to assist the user.
     *
     * @return The identifier of the POM or an empty string if not known, never {@code null}.

 * metadata graph vertice - just a wrapper around artifact's metadata
 *
 */
@Deprecated
public class MetadataGraphVertex implements Comparable<MetadataGraphVertex> {
    ArtifactMetadata md;

    // indications to use these in comparison
    private boolean compareVersion = false;
    private boolean compareScope = false;

    public MetadataGraphVertex(ArtifactMetadata md) {
        super();
        this.md = md;
    }

        String testPluginArtifactId = "maven-compiler-plugin";

        // this is the plugin we're looking for.
        validPluginCounts.put(testPluginArtifactId, 0);

        // these are injected if -DperformRelease=true
        validPluginCounts.put("maven-deploy-plugin", 0);
        validPluginCounts.put("maven-javadoc-plugin", 0);
        validPluginCounts.put("maven-source-plugin", 0);

   | when invoking a command line like "mvn prefix:goal". Maven will automatically add the group identifiers
   | "org.apache.maven.plugins" and "org.codehaus.mojo" if these are not already contained in the list.
   |-->
  <pluginGroups>
    <!-- pluginGroup
     | Specifies a further group identifier to use for plugin lookup.
    <pluginGroup>com.your.plugins</pluginGroup>
    -->

            }
            if (idx < tok.length) {
                qualifier = tok[idx++];
                fallback = isDigits(qualifier);
            }

            // string tokenizer won't detect these and ignores them
            if (part1.contains("..") || part1.startsWith(".") || part1.endsWith(".")) {
                fallback = true;
            }

            if (fallback) {

import org.apache.maven.api.services.ModelProblem;

/**
 * There are various forms of results that are represented by this class:
 * <ol>
 * <li>success - in which case only the model field is set
 * <li>success with warnings - model field + non-error model problems
 * <li>error - no model, but diagnostics
 * <li>error - (partial) model and diagnostics
 * </ol>
 * Could encode these variants as subclasses, but kept in one for now
 *