ID-rule

An ID-rule X <math>\rightarrow</math> <math>Y_1,</math> <math>Y_2,</math> ..., <math>Y_n </math> is interpreted as a well-formedness condition for local trees: It licenses all local trees with a root X and daughters <math>Y_1,</math> <math>Y_2,</math> ..., <math>Y_n </math>. The order of the daughters dominated by X is considered to be irrelevant.

See also

• Generalized Phrase Structure Grammar
• ID/LP rules
• LP-rule

Comment

ID-rules were first introduced in Generalized Phrase Structure Grammar. Moder unification-based grammar formalisms like Head-Driven Phrase Structure Grammar use a small number of highly general ID schemata instead.

Formally, the righthand side of an ID-rule can be considered as a multi sets.

Other Languages

• German ID-Regel

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