DOI: 10.35111/e6p0-9s32
title: Prague Dependency Treebank 2.0

description: <h3>Introduction</h3><br>
<p>The Prague Dependency Treebank 2.0 (PDT 2.0) was developed by Charles University and contains approximately 2 million words of Czech text with complex and interlinked morphological, syntactic, and complex semantic annotation. In addition, certain properties of sentence information structure and coreference relations are annotated at the semantic level.</p><br>
<p>PDT 2.0 follows <a href="../../../LDC2001T10">Prague Dependency Treebank 1.0 (LDC2001T10)</a> and is based on the long-standing Praguian linguistic tradition, adapted for the current Computational Linguistics research needs. The corpus itself uses the latest annotation technology. Software tools for corpus search, annotation, and language analysis are included. Extensive documentation (in English) is provided as well.</p><br>
<h3>Data</h3><br>
<p>The data in this corpus comes from four sources:</p><br>
<ul><br>
<li>Lidov&eacute; Noviny (daily newspapers), 1991, 1994, 1995</li><br>
<li>Mlad&aacute; Fronta Dnes (daily newspapers), 1992</li><br>
<li>Českomoravsk&yacute; Profit (business weekly), 1994</li><br>
<li>Vesm&iacute;r (scientific journal), 1992, 1993</li><br>
</ul><br>
<p>The texts in electronic form have been provided by the <a href="https://ucnk.ff.cuni.cz/en/">Institute of the Czech National Corpus</a>.</p><br>
<p>The data in PDT 2.0 are annotated on three layers&mdash;the morphological layer, analytical layer, and tectogrammatical layer. The following table shows the breakdown by annotation layer and source of data amounts in K-words (thousands of words). Each subsequent layer is additive, so everything that was annotated at the a-layer was also annotated at the m-layer, and everything annotated at the t-layer was also annotated at the other two layers.</p><br>
<table style="margin-top: 30px; margin-bottom: 30px;" border="1" width="60%"><br>
<tbody><br>
<tr><br>
<td>Layer</td><br>
<td>Lidov&eacute; Noviny</td><br>
<td>Mlad&aacute; Fronta Dnes</td><br>
<td>Českomoravsk&yacute; Profit</td><br>
<td>Vesm&iacute;r</td><br>
<td>Total</td><br>
</tr><br>
<tr><br>
<td>m-layer</td><br>
<td>1,235</td><br>
<td>373</td><br>
<td>171</td><br>
<td>178</td><br>
<td>1,957</td><br>
</tr><br>
<tr><br>
<td>a-layer</td><br>
<td>920</td><br>
<td>234</td><br>
<td>171</td><br>
<td>178</td><br>
<td>1,504</td><br>
</tr><br>
<tr><br>
<td>t-layer</td><br>
<td>640</td><br>
<td>119</td><br>
<td>74</td><br>
<td>0</td><br>
<td>833</td><br>
</tr><br>
</tbody><br>
</table><br>
<p>The primary data format for PDT 2.0 is an XML6-based format called PML. A SGML-based format, called CSTS, has been the primary format of PDT 1.0. It is now used only as an intermediate format in older NLP tools (such as taggers and parsers).</p><br>
<p>As usual, the data are divided into three groups: the training data, the development test data and the evaluation test data. The training data cover approximately 80%, development 10% and evaluation 10% of the whole set of data (these proportions hold for all the three layers of annotation).</p><br>
<h3>Samples</h3><br>
<p>For an example of the data in this corpus, please view these <a href="http://ufal.mff.cuni.cz/pdt2.0/visual-data/sample/index.htm" rel="nofollow">samples</a>.</p><br>
<h3>Updates</h3><br>
<p>None at this time.</p></br>
Portions © 1991, 1994,1995 Lidové noviny daily newspapers, © 1992 Mladá fronta Dnes daily newspapers, © 1994 Ceskomoravský Profit business weekly, © 1992-1993 Vesmír scientific magazine, Academia Publishers, © 1996-2005 Institute of Formal and Applied Linguistics and Center for Computational Linguistics, Faculty of Mathematics and Physics, Charles University, © 2006 Trustees of the University of Pennsylvania