Re: SUMMARY: Re: Sorting on a variable

PS

sum(price[@curr='xxx']) is probably quicker and better than
concat('0',price[@curr='xxx']) 

especially if there is any chance of white space in the input
<price curr='xxx'>
 1213
</price>

would kill the concat('0' construction.

In either case of course, th epoint is is to produce a version of 
price[@curr='xxx'] which acts as 0 rather than NaN in the case
that there is no element with that attribute.

David


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