|That clause: partial sentence, expresses e.g. a belief (propositional attitude). This content is intensional, i.e. it is not objective. For some authors, the partial sentence "that it is raining" is the name of the sentence "It is raining".|
Books on Amazon
Name: of facts and propositions: that-expressions - name of universals: mean the property - name of a concept: the very concept (can not be owned like a property).
Einführung in die Ontologie Darmstadt 2004