[oslc-core] OSLC Core spec query shapes example

[Dave]

To better understand how queries work in the OSLC Core spec today,
here's an example that shows how to define a blogging service with
blog entries, blog comments and a query capability that can query
across both types of resources.

  http://open-services.net/bin/view/Main/OslcCoreQueryDiscussion

Examples are provided in RDF/XML of these resources:
- Blog Entry, Blog Comment and Query Resource shapes
- Service Provider
- Query response

Thanks to Arthur for a quick review and the one query URI example in
the document.

Feedback is welcome, as are additional query URI examples.

Thanks,
Dave