Filters non-standard relationships that are outgoing from the given concept.
Filters non-standard relationships of the given type that are outgoing from the given XML element.
Finds all non-standard relationships that are outgoing from the given concept.
Finds all non-standard relationships of the given type that are outgoing from the given XML element.
Purely abstract trait offering a non-standard relationship query API.
Implementations should make sure that looking up relationships by source XML fragment key is fast.
Implementations may be strict or lenient in enforced requirements on the relationship container.
For some of the graph theory terms used, see http://artint.info/html/ArtInt_50.html.