OptionalinteriorInterior graph edges.
Optionalid?: stringStable edge id, used as the UGM edge id of the interior
projection (issue #48). Omitted, the graph generates one and the
same interior edge gets a different id on every projection. Must
be unique across the holon's interior edges and should not reuse
an interior node id (one Cytoscape id space, as for Portal.id);
on a duplicate the first edge wins and the later one is skipped,
the way an edge with a missing endpoint is already skipped.
Optionalproperties?: PropertyMapOptionalinteriorInterior graph nodes (simplified flat representation).
Portals connecting this holon to others.
A holon in the four-graph model (Interior, Boundary, Projection, Context).