GrETEL stands for Greedy Extraction of Trees for Empirical Linguistics. It is a user-friendly search engine for the exploitation of syntactically annotated corpora or treebanks. If you are new to GrETEL we recommend you to take a look at the documentation.

Example-based Search

Enables you to use a natural language example as a starting point for searching a treebank. The query procedure consists of several steps, which allows you to define how similar the search results and the input example should be. In this way you can query a treebank without knowledge of the XPath query language, the tree representations, nor the exact grammar implementation used for the annotation of the trees.

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XPath Search

Enables you to query a treebank by means of an XPath query. This search mode is intended for experienced XPath users, as you need to build the XPath query yourself.

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Corpus Upload

Allows you to upload your own corpus to GrETEL.

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Please cite the following paper if you have used GrETEL for your research:

Jan Odijk, Martijn van der Klis and Sheean Spoel (2018). “Extensions to the GrETEL treebank query application” In: Proceedings of the 16th International Workshop on Treebanks and Linguistic Theories. Prague, Czech Republic. pp. 46-55.