A feed is an XML representation of its HTML counterpart that carries more structured semantics than the HTML contents of a blog as rendered for a person.
As a result of linear composition of words and the multi-dimensional representation of semantics, a syntactic structure has two kinds of grammatical relations: the overt and the covert.
The citation network lacks the semantics and can not be reasoned. To research the semantic representation of the citation networks and semantic reasoning we need that.