The construction as far as NP is concerned has two functions in English: as a marker of contrastive topic and as an evidential. Due to its homophonous nature, this construction illustrates how meaning is not always a function of semantic compositionality. Thus, it is problematic for syntactic theories that have only compositional means to account for semantic and syntactic relationships. However, a constructional approach, viz. Construction Grammar, is useful for analyzing ambiguous constructions because it makes use of conventions which distinguish pragmatic functions and allows meaning to be attached to syntactic forms.
"A Constructional Approach to as far as NP is concerned,"
Colorado Research in Linguistics: Vol. 15.
Available at: https://scholar.colorado.edu/cril/vol15/iss1/2