Hi Urmas - I know you're an experienced bug triager + bug reporter. Please provide all the details we usually require for bug reports. We'd hate to give the impression to new triagers that experienced bug reporters/triagers don't report bugs with reproducible steps, expected result, observed result and appropriate attachments.

Marking as NEEDINFO - UNCONFIRMED once requested information is provided.

Also if this is a new problem would be nice information

Created attachment 95272 [details]
Example of invald id

W3C Validator says that the attachment is invalid.
See http://validator.w3.org/check?uri=https%3A%2F%2Fbugs.freedesktop.org%2Fattachment.cgi%3Fid%3D95272&charset=%28detect+automatically%29&doctype=Inline&group=0&verbose=1&user-agent=W3C_Validator%2F1.3+http%3A%2F%2Fvalidator.w3.org%2Fservices

Line 19, Column 36: character "“" is not allowed in the value of attribute "id"

But why? According to http://www.w3.org/TR/xml/#NT-Nmtoken the "“" character (#x201C) can be part of XML names.