[TF-PP] Property Paths use cases

((To help tracking I've added [TF-PP]  Is there a way to tie email about this task force automatically to the wiki?))

http://www.w3.org/2009/sparql/wiki/TaskForce:PropertyPaths


To start, I'd like to compile some use cases to help us understand the problem space, the limitations and requirements.

There are a few in the examples on the feature page [1] that include subclass and simple cases of just convenient abbreviation so there is a starting point there.  I've extracted those to seed the discussion.  Please add more.  Getting coverage matters so a written description without concrete example is just as helpful.

	Andy

[1] http://www.w3.org/2009/sparql/wiki/Feature:PropertyPaths