Javadoc
Nodes and Edges comprise an additional directed graph through the
contains-a relationship, in which a MetaParent Node contains each of its
MetaChild Nodes and Edges. A Node may have any number of MetaChildren.
edgeMetaChildrenList returns a new List of the Edge MetaChildren (in this
GraphPerspective) of the Node in this GraphPerspective with the given
index. If there are no Edge MetaChildren then the result will be the
empty List; null is returned if no Node exists in this GraphPerspective at
specified RootGraph index.