On Tue, Mar 03, 2020 at 03:37:51PM -0000, Kerry, Richard
richard(_dot_)kerry(_at_)atos(_dot_)net scripsit:
What I am actually trying to do is to get a number of XML files processed.
The files are in similar folders, called 'input' and 'output'. The files'
names follow a couple of name patterns, acq_(\d{4}) and out_(\d{4}). There is
identical code to scan through the folders and identify the files I want to
process (and extract the numbers from the filenames). They are then passed
to apply-templates with the different modes as mentioned.
So the file scanning, while not especially complicated, is not entirely
trivial and I'd like to have it written just once. And then, because the
contents of the files differs in structure, they are handled by different
templates, with different modes.
If you have a sequence of document nodes in a variable, $inputFiles,
<xsl:apply-templates mode="AsAppropriate"
select="$inputFiles[local:selectFunction(.)]" />
will let you filter $inputFiles on the basis of your locally
defined selectFunction returning true or false. (or some other
predicate; you might not even need to define a function,
[matches(document-uri(.),'acq_(\d{4})')]
could be all you need.)
You can do this sequentially in the main template with repeated
apply-templates using different select functions in the predicates.
At least with Saxon, this kind of pattern is reasonably efficient.
-- Graydon
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