Full Idea
The original debate was over abstract ideas; thus it was mental (or linguistic) representations that were classified as abstract or otherwise, and not the entities represented.
Gist of Idea
The old debate classified representations as abstract, not entities
Source
JP Burgess / G Rosen (A Subject with No Object [1997], I.A.1.b)
Book Reference
Burgess,J/Rosen,G: 'A Subject with No Object' [OUP 1997], p.17
A Reaction
This seems to beg the question of whether there are any such entities. It is equally plausible to talk of the entities that are 'constructed', rather than 'represented'.