Constraint Grammar

Constraint Grammar is a tool that can be used to POS-tag ambiguous text. There are free constraint grammars developed outside the Apertium project for: Norwegian (the Oslo-Bergen tagger), Sámi languages (from Giellatekno) and Faroese (also from Giellatekno).

Terminology

See also: Apertium stream format

• cohort — a surface form of a word, along with its analyses (possible lexical units), an ambiguous lexical unit.

Apertium equivalent: ^words/word<n><pl>/word<vblex><pres><p3><sg>$

• baseform — the lemma of a word.
• reading — a single analysis of a word.

Apertium equivalent: ^word<n><pl>$

• wordform — a surface form of a word.

Languages using CG in Apertium

• Breton
• Welsh
• Norwegian Nynorsk and Norwegian Bokmål
• Irish Gaelic

See also

• Apertium and Constraint Grammar -- installation and use
• Constructing a TSX file with a Constraint Grammar

External links

• VISL CG-3 Development Information
• Basic Tutorial for VISL CG-3
• cg-mode for emacs, gives basic syntax highlighting and indentation