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Table of Contents

Treebanks for Various Languages

Arabic (ar)

Prague Arabic Dependency Treebank (PADT)

Versions

The CoNLL 2007 version reportedly improves over CoNLL 2006 in quality of morphological annotation. Both CoNLL versions miss important parts of the original PADT annotation (see below).

Obtaining and License

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:

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.

PADT was created by members of the Institute of Formal and Applied Linguistics (Ústav formální a aplikované lingvistiky, ÚFAL), Faculty of Mathematics and Physics (Matematicko-fyzikální fakulta), Charles University in Prague (Univerzita Karlova v Praze), Malostranské náměstí 25, Praha, CZ-11800, Czechia.

Domain

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

Size

According to their website, the original PADT 1.0 contains 113,500 tokens annotated analytically. The CoNLL 2006 version contains 59752 tokens in 1606 sentences, yielding 37.21 tokens per sentence on average (CoNLL 2006 data split: 54379 tokens / 1460 sentences training, 5373 tokens / 146 sentences test). 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).

References

Inside

The original PADT 1.0 is distributed in the FS format. The CoNLL versions are distributed in the CoNLL-X format. The original PADT contains more information than the CoNLL version. There is morphological annotation (tags and lemmas) both manual and by a tagger (while only manual is in CoNLL data), glosses etc. However, the most important piece of information that got lost during the conversion to CoNLL is the FS attribute called parallel. It distinguishes conjuncts from shared modifiers of coordination and thus the syntactic structure is incomplete without it.

Sample

The first two sentences of the CoNLL 2006 training data:

1 غِيابُ_giyAbu غِياب_giyAb N N case=1|def=R 0 ExD _ _
2 فُؤاد_fu&Ad فُؤاد_fu&Ad Z Z _ 3 Atr _ _
3 كَنْعان_kanoEAn كَنْعان_kanoEAn Z Z _ 1 Atr _ _
1 فُؤاد_fu&Ad فُؤاد_fu&Ad Z Z _ 2 Atr _ _
2 كَنْعان_kanoEAn كَنْعان_kanoEAn Z Z _ 9 Sb _ _
3 ،_, ،_, G G _ 2 AuxG _ _
4 رائِد_rA}id رائِد_rA}id N N _ 2 Atr _ _
5 القِصَّة_AlqiS~ap قِصَّة_qiS~ap N N gen=F|num=S|def=D 4 Atr _ _
6 القَصِيرَةِ_AlqaSiyrapi قَصِير_qaSiyr A A gen=F|num=S|case=2|def=D 5 Atr _ _
7 فِي_fiy فِي_fiy P P _ 4 AuxP _ _
8 لُبْنانِ_lubonAni لُبْنان_lubonAn Z Z case=2|def=R 7 Atr _ _
9 رَحَلَ_raHala رَحَل-َ_raHal-a V VP pers=3|gen=M|num=S 0 Pred _ _
10 مَساءَ_masA'a مَساء_masA' D D _ 9 Adv _ _
11 أَمْسِ_>amosi أَمْسِ_>amosi D D _ 10 Atr _ _
12 عَن_Ean عَن_Ean P P _ 9 AuxP _ _
13 81_81 81_81 Q Q _ 12 Adv _ _
14 عاماً_EAmAF عام_EAm N N gen=M|num=S|case=4|def=I 13 Atr _ _
15 ._. ._. G G _ 0 AuxK _ _

TO DO

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