themselves:

+-----+
<plugins>
  <plugin>
   <id>xdoc</id>
   <version>1.0</version>
   <parameters>
     <parameter>
       <name>theme</name>
       <value>classic</value>
     </parameter>
   </parameters>
  </plugin>
</plugins>
+-----+

Unified source directory

          <artifactId>maven-it-plugin-configuration</artifactId>
          <version>2.1-SNAPSHOT</version>
          <inherited>true</inherited>
          <configuration>
            <listParam>
              <!-- NOTE: These values are deliberately not in alpha order! -->
              <listParam>PARENT-1</listParam>
              <listParam>PARENT-3</listParam>
              <listParam>PARENT-2</listParam>

Inheritance in Maven

 In order the understand how inheritance works in Maven there are a few notions that you must be familiar with:

 * The maven super model

 * how parent poms are processed

 * the order in which elements in the POM are overridden

 * minimum element-set for a valid project pom


Maven super model

 Inheritance is recursive in Maven but there is a special model which is the implicit super parent in the lineage

======================

You have found a bug or you have an idea for a cool new feature? Contributing
code is a great way to give something back to the open source community. Before
you dig right into the code, there are a few guidelines that we need
contributors to follow so that we can have a chance of keeping on top of
things.

Some of the ideas are documented in the [Maven Wiki][maven-wiki]

 Introduction
 -----
 Hervé Boutemy
 -----
 2016-05-29
 -----

Maven Compat

 Maven2 classes maintained as compatibility layer for plugins that need to keep Maven2 compatibility.

 Plugins should avoid these classes and be updated to use only Maven3 dependencies (and require Maven3): see
 {{{https://cwiki.apache.org/confluence/display/MAVEN/Plugin+migration+to+Maven3+dependencies} Plugin migration to Maven3 dependencies}}

     * this is the byte offset into that stream, but if the input source is
     * a character media then the offset is the character offset.
     * Returns -1 if there is no offset available.
     * @return the current offset
     */
    int getCharacterOffset();

    /**
     * Returns the public ID of the XML
     * @return the public ID, or null if not available
     */

import org.apache.maven.api.annotations.Nonnull;

/**
 * Transporter provider is a service that provides somewhat trivial transport capabilities backed by Maven internals.
 * This API does not try to cover all the requirements out there, just the basic ones, and is intentionally simple.
 * If plugin or extension needs anything more complex feature wise (i.e. HTTP range support or alike) it should
 * probably roll its own.
 * <p>

/**
 * A test which demonstrates maven's recursive inheritance where
 * a distinct value is taken from each parent contributing to
 * the final model of the project being assembled. There is no
 * overriding going on amongst the models being used in this test:
 * each model in the lineage is providing a value that is not present
 * anywhere else in the lineage. We are just making sure that values

                }

                problems = true;
            }
        }

        if (problems) {
            LOGGER.warn("");
            LOGGER.warn("It is highly recommended to fix these problems"
                    + " because they threaten the stability of your build.");
            LOGGER.warn("");
            LOGGER.warn("For this reason, future Maven versions might no"

        this.mojoExecutor = mojoExecutor;
        this.lifecycleStarter = lifecycleStarter;
    }

    public void execute(MavenSession session) {
        lifecycleStarter.execute(session);
    }

    // These methods deal with construction intact Plugin object that look like they come from a standard
    // <plugin/> block in a Maven POM. We have to do some wiggling to pull the sources of information