New paper “Authoritative linked data descriptions of debian source packages using ADMS.SW” accepted at OSS 2013

I’ll be presenting “Authoritative linked data descriptions of debian source packages using ADMS.SW” at OSS 2013.

Here’s the abstract :

The Debian Package Tracking System is a Web dashboard for Debian contributors and advanced users. This central tool publishes the status of subsequent releases of source packages in the Debian distribution.

It has been improved to generate RDF meta-data documenting the source packages, their releases and links to other packaging artifacts, using the ADMS.SW 1.0 model. This constitutes an authoritative source of machine-readable Debian “facts” and proposes a reference URI naming scheme for Linked Data resources about Debian packages.

This should enable the interlinking of these Debian package descriptions with other ADMS.SW or DOAP descriptions of FLOSS projects available on the Semantic Web also using Linked Data principles. This will be particularly interesting for traceability with upstream projects whose releases are packaged in Debian, derivative distributions reusing Debian source packages, or with other FLOSS distributions.

Update: If you are interested, a preprint is available here in HTML form. See also previous installments on ADMS.SW in this blog.

Update: The slides of the presentation I made at Isola are here.

The Debian Package Tracking System now publishes Turtle RDF meta-data

The Debian PTS now speaks the Turtle representation format for the export of RDF meta-data about Debian source packages.

Alongside HTML pages for humans, and the RDF/XML that had already been added to it this means that a new flavour of RDF is now available.

The Turtle format offers the benefits of both machine-readable meta-data, and a somehow human readable textual format too.

For instance, you may check the apache2 Turtle meta-data from the command-line with :
$ curl -L -s -H "Accept: text/turtle"

Here’s a link to a colorized HTML preview of

Under the hood, the XSLT stylesheets of the PTS have been reworked to produce the Turtle format by default, and later convert them to RDF/XML.

Every Debian source package then has a reference URI in the Linked Data word, in the form, that redirects, through proper content-negociation (the HTTP Accept header) to the HTML, RDF/XML or Turtle documents. For apache2, these are, resp. at, and

The meta-data uses the model of the ADMS.SW ontology (1.0), and the content has also been slightly updated to make it more conformant to the ADMS.SW specifications (checks done with the ADMS.SW validator).

Let’s hope this makes RDF more familiar to Debian folks, and allows more Linked Data interlinking with other resources about FLOSS packages.

Presented “Generating Linked Data descriptions of Debian packages in the Debian PTS” at the Paris Mini DebConf

I have made a presentation at the Paris MinDebconf 2012 about the work I’ve done to bring more semantic meta-data to the Debian PTS (see previous posts).

Here are my slides :

Also available here as PDF.

foswiki-ldapcontrib packaging started to “replace” twiki-ldapcontrib

Hoping that foswiki will be packaged for Debian soon, I’ve prepared a new package for the LdapContrib Foswiki’s extension, reusing what I had done for the twiki-ldapcontrib package.

This should allow integration of Foswiki on Debian systems using LDAP-stored users and groups.

More details about the package in

CAS client libs need love in Debian : several pending RFS

We have made some progress towards more CAS-ified applications installable in Debian, and now have several RFS pending :

  • libauthcas-perl : Client library for CAS 2.0 / AuthCAS Perl module
  • libcas-php : CAS client library for PHP / phpCAS PHP library

So if you’re a Debian Developer and wish to help improve CAS support in Debian, please sponsor these packages.