Name: Arabic Treebank - Weblog
Description: This release contains 243,117 source tokens before clitics were split, and 308,996 tree tokens after clitics were separated for treebank annotation. The source material is weblogs collected by LDC from various sources.
Provider: University of Pennsylvania
Paper Title: Consistent and Flexible Integration of Morphological Annotation in the Arabic Treebank 
Tasks: part of speech taggin
Venue Name: International Conference on Language Resources and Evaluation (LREC 2010). 
Authors: Mohamed Maamouri, Ann Bies, Seth Kulick, Sondos Krouna, Dalila Tabassi, Michael Ciul
Abstract: Complications arise for standoff annotation when the annotation is not on the source text itself, but on a more abstract representation.
  This is particularly the case in a language such as Arabic with morphological and orthographic challenges, and we discuss various
  aspects of these issues in the context of the Arabic Treebank. The Standard Arabic Morphological Analyzer (SAMA) is closely
  integrated into the annotation workflow, as the basis for the abstraction between the explicit source text and the more abstract token
  representation. However, this integration with SAMA gives rise to various problems for the annotation workflow and for maintaining
  the link between the Treebank and SAMA. In this paper we discuss how we have overcome these problems with consistent and more
  precise categorization of all of the tokens for their relationship with SAMA. We also discuss how we have improved the creation of
  several distinct alternative forms of the tokens used in the syntactic trees. As a result, the Treebank provides a resource relating the
  different forms of the same underlying token with varying degrees of vocalization, in terms of how they relate (1) to each other, (2) to
  the syntactic structure, and (3) to the morphological analyzer. 