MDMI11 — Section 8.6.3 makes several references to ‘source’ and ‘target’ SemanticElements

Section 8.6.3 makes several references to ‘source’ and ‘target’ SemanticElements. However the metamodel does not use these terms – but ‘context’ (which I presume is ‘source’) and ‘relatedSemanticElement’ (which I presume is ‘target’). The descriptions of the properties sourceIsInstance and targetIsInstance are confusing, do not make sense, and in some cases are outright wrong (e.g. “the relatedSemanticElement owns the relationship by composition”). The scope when sourceInstance=’false’ is unclear – is it all instances of the semanticElement class in the message? The known universe?