Quick "last call" before CR for Data Shapes' SHACL

The RDF Data Shapes Working Group is nearing the end of its charter and 
wants to do one last quick check to see if there's anything that really 
MUST be fixed before going to Candidate Recommendation.

New draft published today: https://www.w3.org/TR/shacl/

As the draft says:

  * Please provide your *feedback by Friday, 17 March 2017* at the
    latest. If you need more time than that, please let us know what you
    need.
  * If you have made earlier comments that you don't consider as having
    been addressed, please tell us again.
  * We are especially interested in plans to implement. Comments simply
    indicating plans to use this work are also helpful.
  * You can either submit your feedback as an issue on our GitHub
    repository <https://github.com/w3c/data-shapes/issues> (preferred)
    or via the public mailing list
    <https://lists.w3.org/Archives/Public/public-rdf-shapes/>.

Thanks!

       -- Sandro Hawke, W3C, on behalf of the RDF Data Shapes Working Group