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.
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