Prague Arabic Dependency Treebank (PADT)

• Original PADT 1.0 as distributed by the LDC
• CoNLL 2006
• CoNLL 2007

The CoNLL 2007 version reportedly improves over CoNLL 2006 in quality of morphological annotation.

The original PADT 1.0 is distributed by the LDC under the catalogue number LDC2004T23. It is free for LDC members 2004, price for non-members is unknown (contact LDC). The license in short:

• non-commercial research usage
• no redistribution
• cite one publication in publications; also include: “The PADT 1.0 has been developed by the Institute of Formal and Applied Linguistics and the Center for Computational Linguistics (see http://ufal.mff.cuni.cz/).”

The CoNLL 2006 and 2007 versions are obtainable upon request under similar license terms. Their publication in the LDC together with the other CoNLL treebanks is being prepared.

Newswire text from press agencies (Agence France Presse, Ummah, Al Hayat, An Nahar, Xinhua 2001-2003).

According to their website, the original PADT 1.0 contains 113,500 tokens annotated analytically. The CoNLL 2007 version contains 116,793 tokens in 3043 sentences, yielding 38.38 tokens per sentence on average (CoNLL 2007 data split: 111,669 tokens / 2912 sentences training, 5124 tokens / 131 sentences test).

• Documentation of m-tags, s-tags etc., tokenization issues, vocalization, Buckwalter transliteration, link to Elixir
• Link to website, citation of the data (LDC), citation of the main publication
• Sample sentence, statistics of nonprojectivity etc.
• Known published parsing accuracies, especially CoNLL 2006 and 2007
• Missing is_member attribute in CoNLL versions