GiellaLT

GiellaLT provides an infrastructure for rule-based language technology aimed at minority and indigenous languages, and streamlines building anything from keyboards to speech technology. Read more about Why. See also How to get started, and our Privacy document.

Introduction to working on corpora at Giellalt

This document will teach the user how to convert files in the corpus repositories to xml, and how to extract text from these documents.

The GiellaLT corpus philosophy

The corpora at GiellaLT are

  1. The corpora must be usable for multiple purposes, and thus have metadata for each corpus file.
  2. A central principle is that the original files shall not be changed. This makes it possible to do research om the original form of the files.
  3. For each file filename.ext (where .ext = .doc, .docx, .pdf, .odt, .html, .epub, …), there are three files:
    1. in the folder corpus-xxx-orig, there is for each filename.doc (or docx, …), there is a filename.doc.xsl, containing metadata (title, author, year, …)
    2. in the folder corpus-xxx there is (in the same subfolder) a file filename.doc.xml containing the converted text
  4. The corpus files are divided in two groups, open and closed files (for copyright reasons).

For a presentation of the mechanisms behind this, see:

Huhmarniemi, Saara, Sjur Moshagen and Trond Trosterud 2007: Usage of XSL Stylesheets for the annotation of the Sámi language corpora. LAW ‘07: Proceedings of the Linguistic Annotation Workshop, p. 45–48. Morristown, NJ, USA: Association for Computational Linguistics.

Converting the corpus to xml

To be able to convert files in our repository, you have to check out our tools and do a basic setup.

The corpus is stored using git.

For each language, the corpus files are divided in a free and a restricted part. Each corpus has two directories, one for the original files (*docx, pdf, html, …) and one for the converted text files (xml). For a language with ISO code xxx, the four repositories are:

corpus-xxx
corpus-xxx-orig
corpus-xxx-x-private
corpus-xxx-orig-x-private

Access to the private repositories are restricted for copyright reasons, and are given only to project employees working on the corpora. The open ones are available for all, at giithub.com/giellalt/ (search for corpus-xxx, xxx being the ISO code of your language) in the search field).

Extract text from the corpus

The converted xml files are found in the corpus-xxx/converted/ catalogue. To get all North Saami text, issue the command ccat -a -r -l sme corpus-sme/converted. The options available for ccat are listed with the command ccat -h.

If you do not have ccat installed (part of our corpustools), you may use cat and get xml files.

Divvun/Giellatekno corpus documentation

(this documentation may be obsolete)

Other corpora

DTD -discussion

Conversion

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