I'm reading Goldberg's Constructions and find her employing the symbol 'OBL' to represent a category of syntactic constituent.
SUBJ OBL OBJ
I take it that 'OBL' is read 'oblique' in some sense; but I am puzzled to understand exactly what sense, since it seems to embrace both preposition phrases and adjective phrases (e.g. 'OBLPP/AP'), standing in for what I would categorize as adjectival and locative predicate complements. I have found no instance where 'OBL' is realized as a nominal, and it's not the object of a preposition, so it doesn't appear to be an oblique object in either of the senses I'm familiar with.
Can anyone provide a name and definition for this symbol? And for lagniappe, can anyone tell me how folks who use this symbol represent a nominal predicate complement?