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.
island grammar is applicable in shorthand
shorthand also doesn't rely on complete syntax, it follows that island grammar would be related
( z1 apply :ARG1 ( z2 grammar :mod ( z3 island ) ) :manner ( z4 shorthand ) )