Re: [xliff] Re: Survey/SUO feedback

<_expression_>      ::= "#" ["/"] <selector> {<selectorSeparator> <selector>}
<selector>        ::= [<prefix> <prefixSeparator>] <id>
<prefix>          ::= NMTOKEN
<id>              ::= NMTOKEN
<prefixSeparator> ::= "="
<selectorSeparator>  ::= "/"