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Table 2 Rule set for shallow parsing. The rules are used to identify general verbal and prepositional relations between noun phrases in text. N is a noun, Det a determiner, Adj an adjective, Adv an adverb, P a preposition, NP a noun phrase, PP a prepositional phrase, VP a verb phrase, VG a verb group, and REL is the target relation. Notice, that the grammar does not consider coordinating conjunctions, e.g. with "and", "or" and ",".

From: Annotation of protein residues based on a literature analysis: cross-validation against UniProtKb

NP = Det? (Adj|Adv|N)* N
PP = P NP
VG = (Adv|Aux|V|InfTo)* V
VP = VG NP PP*
REL = NP PP* VP