Expressions in SELECT

Fred,

The design message I metioned was:

http://lists.w3.org/Archives/Public/public-rdf-dawg/2006AprJun/0145

An explicit assigment might be the best long term approach if it is also
available in the main part of the query, otherwise a syntax that is
specific to the SELECT clause seems more appropriate.  To be compatible
with the results format as it stands, there needs to be a variable name
- that could change to a more general label - but just positional does
not work because the XML results format omits unbound variables, not
record them explicitly. 

- - - - - -

What was the issue for SQL with ambiguity that you worked on?  Was it
syntactic ambiguity or an interpretion/associativity ambiguity?  

	Andy