A FeatureStructure is a set of one or more FeatureSpecifications. A FeatureStructure is a kind of information structure, a container or data structure, used to group together qualities or features of some object. In a grammatical feature system, a FeatureStructure holds the grammatical information associated with some linguistic unit. In a typed feature system, a FeatureStructure has an associated type, usually a PartOfSpeech. [Shieber 1986; Maxwell, Simons, and Hayashi 2000].
||Thing||This subsumes all structuring relations used for LinguisticDataStructures. As a naming convention to distinguish relations in data structure from other relations, all names of dataStructuringRelations begin with 'has-'.|
||Feature Specification||This relates a FeatureStructure to a FeatureSpecification.|
||Thing||This relates either a FeatureStructure or a FeatureConstraint to its type, expressed by an instance of PartOfSpeech.|