An island grammar is a grammar that only describes a small chunk of the underlying language. It is used in language parsing in situations where there is no requirement for checking the entire syntax of a provided text. Island grammars can be extended with the use of a bridge grammar.
Bridge grammar is broader than island grammar.
( z1 have-degree :ARG1 ( z2 grammar :mod ( z3 bridge ) ) :ARG2 ( z4 broad :ARG1 z2 ) :ARG3 ( z5 more ) :ARG4 ( z6 grammar :mod ( z7 island ) ) )