[xquery-talk] operations on derived numeric type

David Carlisle davidc at nag.co.uk
Fri Aug 30 07:45:40 PDT 2013

On 30/08/2013 15:07, Michael Sokolov wrote:
> PS how many times will I forget that $x-1 is parsed as a variable
> name. A token allowed in a symbol *and* as an operator makes no
> sense.  Old argument I'm sure.

for variables it could (perhaps) have been different but it's more
consistent to keep all identifiers based on the XML Name production, and
the fact that x-1 is parsed as the element name x-1 but x -1 is parsed
as the value of the element x minus 1 caused a lot of headaches in the
design of xpath1, but couldn't really be avoided given that x-1 is a
legal element name. It's not really any different to the difference
between $x div 1 and $xdiv1.


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