SYSMOAS_ — Definition ExternalData is unclear

The spec says "and represents the relationship between a
KerML Element [KerML] in a provider tool or repository to ExternalData in another tool or repository." This sounds very vague given that the neither the notions repository or tool have official definitions.

The spec also says "ExternalData may be a KerML Element or a non-KerML Element." I don't see how this is significant given that access is via IRI anyway.