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  • GrETEL Search Engine for Querying Syntactic Constructions in Treebanks

    GrETEL is a query engine in which linguists can use a natural language example as a starting point for searching a treebank with limited knowledge about tree representations and formal query languages. Instead of a formal search instruction, it takes a natural language example as input. This provides a convenient way for novice and non-technical users to use treebanks with a limited knowledge of the underlying syntax and formal query languages. By allowing linguists to search for constructions similar to the example they provide, it aims to bridge the gap between descriptive-theoretical and computational linguistics. The example-based query procedure consists of several steps. In the first step the user enters an example of the construction he/she is interested in. In the second step the example is returned in the form of a matrix, in which the user specifies which aspects of this example are essential for the construction under investigation. The third step provides an overview of the search instruction, i.e. the subpart of the parse tree that contains the elements relevant for the construction under investigation. This query tree is automatically converted in an XPath query which can be used for the actual treebank search. This query can be edited if desired. In the fourth step the query is executed on the selected corpus. The matching constructions are presented to the user as a list of sentences, which can be downloaded. The user can also click on the sentences in order to visualize the results as syntax trees. GrETEL enables search in the LASSY-SMALL and the CGN (Spoken Dutch Corpus) Treebanks (1 million tokens each). GrETEL was created by CLARIN Dutch Language Union in Flanders in the context of the CLARIN-NL / CLARIN Flanders cooperation project.
    Liesbeth Augustinus, Vincent Vandeghinste, and Frank Van Eynde (2012). "Example-Based Treebank Querying" In: Proceedings of the 8th International Conference on Language Resources and Evaluation (LREC-2012). Istanbul, Turkey. pp. 3161-3167
    Augustinus, L, Vandeghinste, V, Schuurman, I and Van Eynde, F. 2017. GrETEL: A Tool for Example-Based Treebank Mining. In: Odijk, J and van Hessen, A. (eds.) CLARIN in the Low Countries, Pp. 269–280. London: Ubiquity Press. DOI: https://doi.org/10.5334/bbi.22. License: CC-BY 4.0
    http://gretel.ccl.kuleuven.be/project/publications.php

  • Corpus Studio Web

    Summary CorpusStudio is a web application that facilitates in-depth quantitative syntactic research for linguists. Background CorpusStudio is a web application that facilitates in-depth quantitative syntactic research for linguists. It does so by supporting researchers in writing queries that operate on syntactically parsed text corpora in a number of major xml formats. Queries that belong together are kept in xml documents that are called ‘Corpus Research Projects’ (CRPs). These documents contain the queries, the order in which they are to be executed, meta-information about the queries and the project as a whole, as well as a specification of the input used for the project. The use of CRPs helps improve the replicability of corpus research. Access Any CLARIN-NL user can access the CorpusStudio web application and make use of the 'standard' corpora. New users must provide a login name and password, after which they can make use of the application. Adaptable The CorpusStudio code is open-source. Users can take the code, adapt it and use it for their own purposes. Users can also take the code from GitHub as it is, but build their own server in order to run the application on their own text-corpora. User documentation and an API are available (see below). The current version of CorpusStudio supports xml text corpora in the FoLiA and Psdx formats. Extensions to other xml formats are possible. CrpxProcessor provides the basic functionality and is on github on https://github.com/ErwinKomen/CrpxProcessor. CrppServer takes care of /crpp and uses CrpxProcessor. It is on GitHub on https://github.com/ErwinKomen/CrppServer. CrpStudio is on https://github.com/ErwinKomen/CrpStudio, takes care of /crpstudio and uses CrpxProcessor. Main features Keep all important aspects of a research project in one file Define one or more search queries in a hierarchy Uses w3c developed Xquery and Xpath Integrated CorpusStudio-specific Xquery functions User-definable functions and variables Create corpus result databases with user-definable features accompanying each hit Divide the output into calculatable categories Divide the results into meta-data-dependent groups Parallel processing yields a speed-up of a factor 20-100 compared to the Windows version Compatibility with the Windows programs "Cesax" and "CorpusStudio" Limitations and future developments Current limitations to the program include: working with result database, restricted login system, no document view, grouping is restricted to system-defined groups, no query or project wizard. Although the CLARIN-NL project has stopped in December 2015, every effort will be undertaken to make sure that a number of essential features are going to be added.
    Komen, E. R. 2017. Beyond Counting Syntactic Hits. In: Odijk, J and van Hessen, A. (eds.) CLARIN in the Low Countries, Pp. 259–268. London: Ubiquity Press. DOI: https://doi.org/10.5334/bbi.21. License: CC-BY 4.0
    Komen, Erwin R. 2011. Coreferenced corpora for information structure research. In Outposts of Historical Corpus Linguistics: From the Helsinki Corpus to a Proliferation of Resources. (Studies in Variation, Contacts and Change in English 10) Jukka Tyrkkö, Terttu Nevalainen, Matti Rissanen & Matti Kilpiö (eds). Helsinki, Finland: Research Unit for Variation, Contacts, and Change in English.
    Komen, Erwin R. 2013. Finding focus: a study of the historical development of focus in English. Utrecht: LOT.
    Komen, Erwin R. 2013. Corpus databases with feature pre-calculation. In Proceedings of the twelfth workshop on treebanks and linguistic theories (TLT12). Sandra Kübler, Petya Osenova & Martin Volk (eds), 85-96. Sofia, Bulgaria: The institute of information and communication technologies, Bulgarian academy of sciences.