private static final ValidationReportLevel DEFAULT_VALIDATION_LEVEL = ValidationReportLevel.INLINE;

    private static final Collection<ValidationReportLevel> INLINE_VALIDATION_LEVEL = Collections.unmodifiableCollection(
            Arrays.asList(ValidationReportLevel.INLINE, ValidationReportLevel.BRIEF));

    private enum ValidationReportLevel {

          <name>properties</name>
          <description>Extended configuration specific to this profile goes
            here.</description>
          <type>Properties</type>
          <association xml.mapStyle="inline">
            <type>String</type>
            <multiplicity>*</multiplicity>
          </association>
        </field>
        <field>
          <name>repositories</name>
          <version>1.0.0</version>

          <description>Flags this Mojo to require running inside of a reports context. Unsupported since Maven 3.0.</description>
          <defaultValue>false</defaultValue>
        </field>
        <field>
          <name>requiresOnline</name>
          <version>1.0.0/1.1.0</version>
          <type>boolean</type>
          <description>Flags this Mojo to require online mode for its operation.</description>

            if (MojoExecution.Source.CLI.equals(mojoExecution.getSource())) {
                Throwable cause = new IllegalStateException(
                        "Goal requires online mode for execution" + " but Maven is currently offline.");
                throw new LifecycleExecutionException(
                        messageBuilderFactory, mojoExecution, session.getCurrentProject(), cause);

    <classWorldsVersion>1.3</classWorldsVersion>
    <commonsCliVersion>1.0</commonsCliVersion>
    <!--

    Do not update this, Doxia will be decoupled completely from 3.x and someone can
    create a rendering engine for it if they like when the release stabilizes. JVZ

    -->
    <doxiaVersion>1.0-alpha-9</doxiaVersion>
    <easyMockVersion>1.2_Java1.3</easyMockVersion>
    <junitVersion>4.13.1</junitVersion>

    <classWorldsVersion>1.3</classWorldsVersion>
    <commonsCliVersion>1.0</commonsCliVersion>
    <!--

    Do not update this, Doxia will be decoupled completely from 3.x and someone can
    create a rendering engine for it if they like when the release stabilizes. JVZ

    -->
    <doxiaVersion>1.0-alpha-9</doxiaVersion>
    <easyMockVersion>1.2_Java1.3</easyMockVersion>
    <junitVersion>4.13.1</junitVersion>

    online status.

  * If <<<(offline == false) && (requiresOnline == true)>>>, bind
    the mojo to the lifecycle.

    In this case, the client is <<online>>, and the mojo either requires
    <<online>> status, or else doesn't care.

  * Otherwise, don't bind the mojo. Log a debug message to indicate that it is
    sensitive the online state of the application, and that this state is

            Contents take the form of {@code <property.name>property.value</property.name>}
          </description>
          <type>Properties</type>
          <association xml.mapStyle="inline">
            <type>String</type>
            <multiplicity>*</multiplicity>
          </association>
        </field>
        <field xdoc.separator="blank">
          <name>repositories</name>

    <classWorldsVersion>1.3</classWorldsVersion>
    <commonsCliVersion>1.0</commonsCliVersion>
    <!--

    Do not update this, Doxia will be decoupled completely from 3.x and someone can
    create a rendering engine for it if they like when the release stabilizes. JVZ

    -->
    <doxiaVersion>1.0-alpha-9</doxiaVersion>
    <easyMockVersion>1.2_Java1.3</easyMockVersion>
    <junitVersion>4.13.1</junitVersion>

* Eclipse IDE tooling for plugin execution model and metadata model

- we also seem to have information like the plugin lifecycle model that's buried inside the maven execution model
- we also seem to have artifact information tangled inside the plugin model
- we have to deal with scripting implementations (groovy, beanshell, ruby)
- we need to deal with a shared context for plugins, like the guarded mojos