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 grammer broadens island grammers.
( z1 broaden :ARG0 ( z2 product :name ( z3 name :op "Bridge" :op "Grammer" ) ) :ARG1 ( z4 product :name ( z5 name :op "Island" :op "Grammers" ) ) )