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.
A bridge grammar connects an island grammar to the rest of the provided text.
The excerpt didn't specify what the bridge grammar connects to; I borrowed chunks of the text to confuse the system.
( z1 connect :ARG0 ( z2 grammar :mod ( z3 bridge ) ) :ARG1 ( z4 grammar :mod ( z5 island ) ) :ARG2 ( z6 rest :part-of ( z7 text :ARG1-of ( z8 provide ) ) ) )