What's the meaning of addedToClasspath and includesDependencies when make own packaging type?

[sean chen(陈思淼)]

<component>
        <role>
                org.apache.maven.artifact.handler.ArtifactHandler
        </role>
        <role-hint>magma</role-hint>
        <implementation>
                org.apache.maven.artifact.handler.DefaultArtifactHandler
        </implementation>
        <configuration>
                <type>magma</type>
                <language>java</language>               
<addedToClasspath>true</addedToClasspath>
                <includesDependencies >true</includesDependencies>

        </configuration>
</component>

I think that may related to dependency manage when maven deal with the
self-define packaging type.

but who know the exact meaning of it?