in xpath2 you can go
sum(col/@width/number(substring-before(.,'in')))
but if using xslt1 you need to either first do a transform that copies
the nodes but removes the in then use sum(xx:node-set($x)/col/@width)
or use a recursive named template that accumulates the sum "by hand"
rather than using the sum function. (The FXSL library will have lots of
these should you not choose to write one yourself)
David
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