Syntactic grammars are based solely on the structure of words in sentences, but do not use any knowledge of the meaning of the sentance beyond part of speach or similar tags, such as whether a wird is a noun or verb. Syntactic grammars are used in the syntactic analysis stage of natural language processing and the output is typically a parse tree.
Used on pages 290, 302
Portion of a grammar and application to the sentence "who belongs to a union"
Parse tree for the sentence