How do linguists define the idea of a grammatical subject?
The only place I could find on the Internet about linguists' definition of a grammatical subject was at the SIL glossary, here. (http://www-01.sil.org/linguistics/GlossaryOflinguisticTerms/WhatIsASubject.htm).
According to this definition, grammatical subjects often have...
- "The grammatical characteristics of the agent of typically transitive verbs"
- "The grammatical characteristics of the single argument of intransitive verbs"
- "A particular case marking or clause position"
- "The conditioning of an agreement affix on the verb"
- "The capability of being obligatorily or optionally deleted in certain grammatical constructions, such as the following clauses: Adverbial, Complement, Coordinate"
- "The conditioning of same subject markers and different subject markers in switch-reference systems"
- "The capability of co-reference with reflexive pronouns"
The definition doesn't imply that all grammatical subjects in all languages have all of these characteristics.
But I was wondering whether this definition passes muster among the professional linguists on this list. If not, is there are better source of information about what grammatical subjects are?