> This has reached the limit of my understanding of XSL.

But the FAQ has a section on this I believe.
Anyhow in your example you never need an XPath string literal that
contains both " and ' (which is good as you can't have such a thing)
If your XPath string contains ' then you can use the XPath quotes
" so you have "'". To get that into an XML attribute value you
just need to escape one or other of the quotes:

select=""'""
or
select='"'"'

or if belt and braces....

select=""'""
or
select='"'"'

If you do ever need an XPath string containing both " and '
then you can not do it in a single Xpath string literal, you need to use
the concat() function, or a variable.

David

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