Question regarding the availability of services (and resources)

All,

I've got a (maybe dumb) question regarding the availability of
services (and resources), or better say how to describe and handle this.
This may as well concern the 'Best Practice Recipes for Publishing RDF
Vocabularies' deliverable [1], but might also touch POWDER-WG [2] issues
-
I'm unsure about it ...


Now, here comes our problem. When developing SW applications, we
frequently 
encounter the following situation: Say, there are two external services
A and B.
In our SW application I'd like to state that per default service A
should be used,
but in case A is not available (or has too big latency), service B must
be used.

What I've gathered so far (but I must admit, I did not read each and
every post in all the mailing lists ;) is that:

+ The 'POWDER: Use Cases and Requirements' document [3] also tackles
  this issues, IMHO, but I can't find a hook for our problem;

+ The Web Services Policy Working Group [4] has published a policy
  model in its 'Web Services Policy 1.5 - Framework' [5]; though AFAIK
  this is not based on RDF, and I don't know if REST-interfaces are
addressed
  equally.

So, I guess the question would be: Is there a common (RDF-based)
vocabulary
(along with some standardised rules) available that would allow us to
handle
the above described setup on a generic, declarative level?

Any thoughts & pointers welcome!

Cheers,
	Michael

BTW: Please note that - in my understanding - the same might 
     be applicable for resources (or repositories), and equally
     one could extend it regarding QoS issues.

[1] http://www.w3.org/TR/2006/WD-swbp-vocab-pub-20060314/
[2] http://www.w3.org/2007/powder/
[3] http://www.w3.org/TR/2007/NOTE-powder-use-cases-20070525/
[4] http://www.w3.org/2002/ws/policy/
[5] http://www.w3.org/TR/2007/PR-ws-policy-20070706/

----------------------------------------------------------
 Michael Hausenblas, MSc.
 Institute of Information Systems & Information Management
 JOANNEUM RESEARCH Forschungsgesellschaft mbH
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Received on Thursday, 19 July 2007 12:11:07 UTC