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A UNL corpus is a collection of documents written in UNL according to the [[UNL document]] structure. 

== Types ==
UNL corpora are normally classified according to the [[UNLization]] strategies:
*Fully automatic UNLization (the whole process is carried out by the machine, without any intervention of the human user)
*Human-aided machine UNLization (the process is carried mainly by the machine, with some intervention of the human user, either as a pre-editor or as a post-editor, or during the UNLization itself, as in dialogue-based UNLization)
*Machine-aided human UNLization (the process is carried mainly by the human user, with some help of the machine, as in the dictionary or memory lookup)
*Fully human UNLization (the whole process is carried by the human user, without any intervention of the machine)

== UNL Reference Corpus (UC) ==
The UNL Reference Corpus (UC) is the corpus used to prepare and to assess grammars for sentence-based [[NLization]]. It is divided in 6 different levels according to the [[FoR-UNL|Framework of Reference for UNL (FoR-UNL)]]:
*[[UC-A1]]: UNL Reference Corpus A1 (100 isolated sentences with very simple semantic structures)
*[[UC-A2]]: UNL Reference Corpus A2 (300 isolated sentences with very simple semantic structures)
*[[UC-B1]]: UNL Reference Corpus B1 (5 short stories)
*UC-B2: UNL Reference Corpus B2
*UC-C1: UNL Reference Corpus C1
*UC-C2: UNL Reference Corpus C2

== NL Reference Corpus (NC) ==
The [[NC|NL Reference Corpus (NC)]] is the corpus used to prepare and to assess grammars for sentence-based [[UNLization]].

== List of UNL Corpora ==
[[List of UNL Corpora]]