The group discussed a number of issues related to its charter, in particular the proposed timeline of Last Call on the grouping and DR docs by end April allowing transition to CR before the summer break. The Primer and Test Suite should be in the public domain, although not as far advanced by end April too. This presents the group with a lot of work to do and we must be mindful of what is practical within that time frame, however, the pieces are coming together.
The group is beginning to plan a face to face meeting in June to go through Last Call comments, probably in Darmstadt hosted by Deutsch Telekom. We will need to avoid a clash with the Mobile Web and Voice Browser meetings that month.
Specific topics: how we will document the rules for transforming POWDER into POWDER-S. Various options have been proposed including some sort of formal rule language or detailed documentation within the XSLT. The group resolved to include a natural language description in the documents and provide both the XSLT and the Test Suite - which should be ample material to allow an independent implementation of a transformation engine.
The general rule for the transformation is:
ref -> rdf:resource, string -> literal (possibly typed), elements assumed to be embedded RDF/XML.
That is, if you want something to end up as a
rdf:resource, encode it in the XML as a
ref and so on. RDF/XML may be embedded within the POWDER Doc.
We also briefly discussed the proposal that all IRI constraints should be expressed in POWDER-S as regular expressions. This will minimise the number of extensions needed to existing RDF/OWL tools. Implementing the full set of IRI constraints would require much more work in such tools.
The POWDER WG held its second outreach event on 18th March, hosted by the GSM Association. The event provided an opportunity for our guests to learn what POWDER is and how it can help to delivery more targeted, personalised content to the benefit of content providers and consumers alike. Carl Taylor from Hutchinson Whampoa gave a positive assessment of the technology but warned about the problems that slow adoption could pose and the task ahead to convince content providers of the benefits of adding metadata, no matter how trusted and useful it may be. Another guest, Scott Rose from Arqiva, talked about the difficulty, cost and therefore resistance to adding metadata to large repositories of video – something that POWDER is designed to streamline by allowing data to be applied to many different resources at once.
As well as a series of short presentations of the various use cases, Paul Walsh of Segala and Charles McCathieNevile of Opera Software both demonstrated POWDER being used in user-centric applications. Putting on events like this not only helps to spread the word about the technology, it’s also very useful for WG members to get first hand feedback from potential users. The group hopes to organise further outreach events later in the year.
The following presentations from the event are available as PDFs: