when you use a node set, such as //chapmod/attribute::docref in the
argument of a function expecting a string, or explictly coerce it to a
string using string() then XPath1 _always_ takes the string value of the
first node in the set in document order, and discards all the rest.

If your source file had the full filename

<chapmod docref="document1.xml" lang="FR"/>
...

then you would be in much better shape as you could go
select="count(document(//chapmod/@docref)//ht)"

Otherwise your simplest solution is probably to make one pass to make a
document of that form just using an xml-xml transformation to add .xml
to the filenames, then make a second pass that does the above.

Otherwise you'll have to do a recursive template that does the addition
by hand. That isn't hard but changing the input document is easier, if
that is an option.

David

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