#40 Implement Bibtex crawler & subcrawler

[Leo Sauermann]

Implement both a bibtex crawler AND a bibtex subcrawler to convert Bibtex files to RDF.

provide BOTH because users may want all their bibtex files within their folders crawled (subcrawler), but may opt to only crawl/select a single file (crawler with datasource).

Also, the datasource could take configuration values such as supporting JabRef's proprietary pdf= syntax.

For jabref/pdf:

@INPROCEEDINGS{Sauermann2005b,
title = {{The Semantic Desktop---a Basis for Personal Knowledge Management}},
pdf = {Sauermann2005b.pdf}
}

the pdf= link is relative to the path of the bibtex or to some configurable path - so this "absolute path for relative PDF links" must be configurable for a bibtex file, hence a datasource, hence the crawler.

this kind-of-worked in gnowsis, we must reactivate the code from here:
https://gnowsis.opendfki.de/repos/gnowsis/tags/0.8.3-alpha/gnowsis_adapterpack/WEB-INF/src/org/gnowsis/adapters/bibtex/

[Enrico Minack]

Christian K. at L3S implemented a Bibtex extractor, see
http://dev.nepomuk.semanticdesktop.org/repos/trunk/java/de.l3s.aperture/src/java/org/semanticdesktop/aperture/extractor/bibtex/

It is quite atomic so it should be easy to be fully migrated into the aperture source. Please contact Christian if you are interested.

[Leo Sauermann]

This task will be a test-task for an applicant for internship at DFKI.

Ok, so Enrico Minack said the code from L3S should be ported to Aperture.

take http://dev.nepomuk.semanticdesktop.org/repos/trunk/java/de.l3s.aperture/src/java/org/semanticdesktop/aperture/extractor/bibtex/ and find its dependencies.

checkout the aperture-addons project from https://aperture.svn.sourceforge.net/svnroot/aperture/trunk/aperture-addons/ using SVN, add the l3s bibtex extractor to this project and verify if it generates good bibtex.

good bibtex/rdf can be found here:
* http://www.dfki.uni-kl.de/~sauermann/leo_sauermann.bib converts to http://www.dfki.uni-kl.de/~sauermann/rdf/leo_bib.rdf