I need to ensure that each <a2> has a preceding <a1>,
every $a2 in a2 satisfies exists($a2/preceding-sibling::a1)
or more consisely (and in XPath 1.0 syntax)
not(a2[not(preceding-sibling::a1)])
Michael Kay
http://www.saxonica.com/
although there may be intervening tags. I know that
name(preceding-sibling::*[1]
gives me the name of the first preceding sibling, but how do
I construct a test that gives me only the first preceding
<a1> or <a2> tag?
Thanks,
Dave
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