individual or Legal Entity exercising permissions granted by this License. "Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files. "Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types. "Work" shall mean the work of authorship,...

individual or Legal Entity exercising permissions granted by this License. "Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files. "Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types. "Work" shall mean the work of authorship,...

main channel of communication for contributors.  
There are some guidelines which will make applying PRs easier for us:
+ Create a topic branch from where you want to base your work (this is usually the master branch).
  Push your changes to a topic branch in your fork of the repository.
+ Make commits of logical units.
+ Respect the original code style: by using the same [codestyle][code-style],

            forkedProjects = new ArrayList<>(forkedExecutions.size());

            try {
                for (Map.Entry<String, List<MojoExecution>> fork : forkedExecutions.entrySet()) {
                    String projectId = fork.getKey();

                    ProjectIndex projectIndex = session.getSession()
                            .getData()

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.api.plugin;

import org.apache.maven.api.annotations.Consumer;
import org.apache.maven.api.annotations.Experimental;

/**
 * This interface forms the contract required for <code>Mojos</code> to interact with the <code>Maven</code>

        expected.add("maven-it-plugin-expression");
        expected.add("maven-it-plugin-fork");
        expected.add("maven-it-plugin-touch");

        List<String> actual = new ArrayList<>();
        @SuppressWarnings("unchecked")
        List<Plugin> plugins = (List<Plugin>) pom.getValue("build/plugins");
        for (Plugin plugin : plugins) {
            actual.add(plugin.getArtifactId());
        }

        <forkId implementation="int" default-value="-1">${forkId}</forkId>
      </configuration>
    </mojo>
    <mojo>
      <goal>end-fork</goal>
      <description>Restore the non-fork currentProject instance, for use in the forking mojo.</description>
      <requiresDirectInvocation>false</requiresDirectInvocation>
      <requiresProject>false</requiresProject>

            if [ $? -eq 0 ]; then
              echo "Found a branch \"$branch\" in fork \"$user/$repo\", configuring this for the integration tests to be run against."
              target_branch=$branch
              target_user=$user
            else
              echo "Could not find fork \"$user/$repo\" or a branch \"$branch\" in this fork. Falling back to \"$target_branch\" in \"$target_user/$repo\"."
            fi
          else

import org.apache.maven.artifact.repository.DefaultRepositoryRequest;
import org.apache.maven.artifact.repository.RepositoryRequest;
import org.apache.maven.artifact.resolver.ArtifactResolutionRequest;

/**
 * Forms a request to retrieve artifact metadata.
 *
 */
@Deprecated
public class DefaultMetadataResolutionRequest implements MetadataResolutionRequest {

    private Artifact artifact;

        <artifactId>maven-it-plugin-expression</artifactId>
        <version>2.1-SNAPSHOT</version>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.its.plugins</groupId>
        <artifactId>maven-it-plugin-fork</artifactId>
        <version>2.1-SNAPSHOT</version>
      </plugin>
    </plugins>
  </build>