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The [[UNL System]] comprises three different types of language resources: '''lexica''', '''grammars''' and '''corpora'''. These resources have been provided mainly through the [[UNLarium]].

== [[Lexica]] ==
''Main article: [[Lexica]]''
*[[UNL Dictionary]], or UNL<sup>dic</sup>: a flat list of UW's and their corresponding semantic features
*[[UNL Ontology]]: a hierarchy of UW's
*[[UNL Knowledge Base]], or UNL<sup>KB</sup>: a network of necessary interactions between UW's
*[[UNL Memory]]: a network of necessary and typical interactions between UW's 
*[[NL Dictionary]], or NL<sup>dic</sup>: a list of natural language entries and their corresponding features
*[[NL Memory]]: a list of typical interactions between natural language entries
*[[UNL-NL Dictionary]], or UNL-NL<sup>dic</sup>: a list of lexical mappings between UNL and a given natural language
*[[UNL-NL Memory]]: a list of mappings between UNL and a given natural language

== [[Grammar]]s ==
''Main article: [[Grammar]]''

*UNL-NL T-Grammar: used for natural language generation
*UNL-NL D-Grammar: used for improving the results of the UNL-NL T-Grammar
*NL-UNL T-Grammar: used for natural language analysis
*NL-UNL D-Grammar: used for tokenization and for improving the results of the NL-UNL T-Grammar

== [[Corpus|Corpora]] ==
''Main article: [[Corpus]]''

*UNL Corpus: documents written in UNL, to be provided according to the [[UNL document|UNL document structure]]
*NL Corpus: documents written in natural language