A little late due to holidays, here's the blog entry I've been hoping to write since about last November - we've reached Last Call! The group is producing a total of three Recommendation Track documents and Last Call comments on these are welcome through to 14th September.
The Grouping of Resources
document is the oldest of the three and has retained much of its original character from 2007. A critical aspect of POWDER is the ability to define groups (actually now we talk about IRI sets but it's the same beast). The Description Resources
document has been through the most substantial changes since its early days although the first example
in the document doesn't look so different from the first public working draft
version (published nearly a year ago). It's the division between operational and formal semantics, introduced this year, that is the big change between the first and this Last Call version.
The development of the two-version approach (operational and formal semantics) lead to the creation of the Formal Semantics
document which underpins the other two. This is the one that defines the semantic extension required to make POWDER work in an OWL/RDF environment and confers membership of a class on an IRI if it matches one or more regular expressions.
A couple of issues are worth highlighting. Firstly the Description Resources document supports the re-instatement of the HTTP Link Header as proposed by Mark Nottingham
. This also impacts on the wider debate about how @rel values should be managed. Mark Nottingham's Internet Draft makes one suggestion but there are other ideas circulating and the way forward is not 100% clear. It is largely this debate that causes us to flag the recommendation of HTTP Link as a feature at risk.
In the Formal Semantics document we note a further feature at risk, namely the ability to include arbitrary RDF in a POWDER document. There are strong arguments on both sides and the group will make a resolution based on Last Call comments received.
Alongside the Recommendation Track documents, the WG is pleased to publish drafts of its Primer and Test Suite. These will continue to evolve as the group works through Last Call and Candidate Recommendation phases.
Finally, the group has announced its latest outreach event. Called POWDER: More of What You Want, When You Want It
, the event takes place at Yahoo!'s Mission College Campus in Santa Clara on 16th September.