The dwcattributes:organizedInClass properties for the record level terms have the value "all", as in:

<dwcattributes:organizedInClass rdf:resource="all"/>

This XML syntax is interpreted such that the object of the triple is http://rs.tdwg.org/dwc/terms/all, a class that doesn't exist in DwC. It's easier to see in Turtle, where the triple would render like this:

dwc:dataGeneralizations-2009-04-24 dwcattributes:organizedInClass dwc:all.

I suspect that the best solution is to just delete the

<dwcattributes:organizedInClass rdf:resource="all"/>

tags from the RDF/XML rather than trying to define some class that is a union of all Darwin Core classes.