Full Idea
The multiple relations theory of judgement proposes that assertions about propositions are dependent upon genuine facts involving belief and other attitude relations, subjects of those attitudes, and the constituents of the belief.
Gist of Idea
The multiple relations theory says assertions about propositions are about their ingredients
Source
report of B Russell/AN Whitehead (Principia Mathematica [1913]) by Bernard Linsky - Russell's Metaphysical Logic 7.2
Book Reference
Linsky,Bernard: 'Russell's Metaphysical Logic' [CSLI 1999], p.125
A Reaction
This seems to require a commitment to universals (especially relations) with which we can be directly acquainted. I prefer propositions, but as mental entities, not platonic entities.