Re: [xsl] Selecting elements from source document based on matches to a second document

["Liam R. E. Quin liam@xxxxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

On Mon, 2023-03-06 at 03:12 +0000, Trevor Nicholls
trevor@xxxxxxxxxxxxxxxxxx wrote:
>
>
> I would like to produce an output document which consists of a log
> containing all the log entries where at least one of the logentry
> paths
> matches a path in the checkpaths document, and where the paths for
> each
> output logentry are limited to the matching paths.

I'm thinking these are filesystem paths, not XPath expressions. So
here's some first thoughts:

So, given
<xsl:variable name-"paths-to-match" as="xs:string*"
  select="doc('checkpaths.xml')/checkpaths/path" />

you can use
/log/logentry[paths/path = $paths=to-match]

This is O(nB2) on the number of paths, so if you have a lot of paths in
the checkpaths document, you'll want to do something smarter probably,
but this is a start.

To get only the matching paths,

<xsl:apply-templates select="/log/logentry[paths/path = $paths=to-
match]"/>

then have an identity template (assuming XSLT 2; in XSLT 3 use
<xsl:mode on-no-match="shallow-copy"/> instead), and a template
<xsl:template match="path">
  <xsl:if test=". = $paths-to-match">
    <xsl:copy-of select="." />
  </xsl:if>
</xsl:template/>


liam

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