Syntactic Theory
The Valence Principle
This principle is used to allow for shorter formulations of the grammar rules.
In Sag/Wasow/Bender 2003 it is formulated as a default, i.e. as a principle that applies only if nothing else prevents it from applying.
The formulation in Sag/Wasow/Bender 2003, p.158:
The Valence Principle:
Unless the rules says otherwise, the mother's value for the VAL features (SPR, COMPS, and MOD) are identical to those of the head daughter.
Unless the rules says otherwise, the mother's value for the VAL features (SPR, COMPS, and MOD) are identical to those of the head daughter.