There is now a draft [1] of the contextualisation mixin. It is based on the works of OpenStack and the various implementations in EGI-FedCloud. Comments etc always appreciated.

Cheers,

Andy

[1] http://redmine.ogf.org/projects/occi-wg/repository/revisions/27a09123aef5a585c8f598ffcda93e65a912cfb0/diff/infrastructure.tex