Grammar

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In the UNL framework, a grammar is a set of rules that are used to generate UNL out of natural language, and natural language out of UNL.

Types

In the UNL^framework, we distinguish between transformation and disambiguation grammars:

Transformation Grammar, or T-Grammar, is the set of T-rules, which are used to transform structures^[1]
Disambiguation Grammar, or D-Grammar, is the set of D-rules, which are used to improve the performance of the T-rules

The syntax and behavior of T-rules and D-rules are defined in the Grammar Specs.

In the UNL^framework, we distinguish between analysis and generation grammars:

The UNL-NL (Generation) Grammar is used to generate natural language out of UNL
The NL-UNL (Analysis) Grammar is used to generate UNL out of natural language

↑ To convert a list structure into a tree structure, a tree structure into a list structure, a tree structure into a network structure, and so on.