Dependency Grammars
The following frameworks are dependency-based:
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- Algebraic syntax
- Operator grammar
- Functional generative description
- Lexicase grammar
- Meaning–text theory
- Word grammar
- Extensible dependency grammar
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Link grammar is also based on the dependency relation, but link grammar does not include directionality in the dependencies between words, and thus does not describe head-dependent relationships. Hybrid dependency/constituency grammar uses dependencies between words, but also includes dependencies between phrasal nodes – see for example the Quranic Arabic Dependency Treebank. The derivation trees of Tree-adjoining grammar are dependency-based, although the full trees of TAG are constituency-based, so in this regard, it is not clear whether TAG should be viewed more as a dependency or constituency grammar.
There are major differences between the grammars just listed. In this regard, the dependency relation is compatible with other major tenets of theories of grammar. Thus like constituency grammars, dependency grammars can be mono- or multistratal, representational or derivational, construction- or rule-based.
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