In response to your comments on BIND semantics, the working group has decided to reinstate the text in section 18 (definition of SPARQL) from the previous last calls as it more accurately reflects deployed practice.
The changes are in the current editors' working draft:
Descriptive text: http://www.w3.org/2009/sparql/docs/query-1.1/rq25.xml#bind
Formal definitions around: http://www.w3.org/2009/sparql/docs/query-1.1/rq25.xml#sparqlTranslateGraphPatterns
I would be grateful if you reply to this message to confirm that the working group has responded to your comment.
Yours, on behalf of the SPARQL Working Group,