Re: [xsl] preserving the base URI origin of content inlined

My only observation is that you are, expressly, storing the base URI of the document node of the XML instance. I think your observation is not entirely useful in the general sense.

When I need to where a particular node is coming from (maybe or maybe not the document node), I use the base URI of the node itself, not its tree's document node. This is because the element may very well be coming from an external SYSTEM entity.

For example, my XSLT training material is authored in 37 separate external SYSTEM entities across multiple subdirectories and so the base URI of most of the elements is not the base URI of the document element of the one tree.

In your case you are interested only in the document node of what is being referenced in xsl:include and xsl:import, so you don't need to know the base URI of all of the nodes. So in this limited case, your observation is useful.

But I hope this is helpful to those who work with external SYSTEM entities and need to know the true origin directory of any of the tree's nodes.

. . . . . . Ken

At 2023-05-31 11:45 +0000, Chris Papademetrious christopher.papademetrious@xxxxxxxxxxxx wrote:

Hi everyone,

I was writing a stylesheet that analyzed other stylesheets (<https://github.com/dita-ot/dita-ot/issues/4207>https://github.com/dita-ot/dita-ot/issues/4207). I wanted to inline sub-stylesheets referenced by <xsl:include> and <xsl:import>, but I also wanted to determine the origin of any element (top-level or inlined) using base-uri().

When the sub-stylesheets are retrieved and inlined via document(), its base URI property is not preserved. In

<https://www.w3.org/TR/xslt-30/#constructing-complex-content>https://www.w3.org/TR/xslt-30/#constructing-complex-content

it says the following:

When copying an element or processing instruction node, its base URI property is changed to be the same as that of its new parent, unless it has an xml:base attribute (see [XML Base]) that overrides this. If the copied element has an xml:base attribute, its base URI is the value of that attribute, resolved (if it is relative) against the base URI of the new parent node.

(Thanks to Martin for pointing me to this statement!)

To inline the content and remember its origin, we can define an xml:base attribute for the inlined root element as follows:



<xsl:mode name="inline" on-no-match="shallow-copy"/>

<xsl:template match="(xsl:import|xsl:include)[@href]" mode="inline">

<xsl:variable name="target-uri" as="xs:anyURI" select="resolve-uri(@href, base-uri(.))"/>

<xsl:variable name="doc" as="document-node()?" select="$target-uri[doc-available(.)] ! document(.)"/>

<xsl:for-each select="$doc/node()">

<xsl:choose>

<xsl:when test=". instance of element()">

<xsl:copy select=".">

<xsl:attribute name="xml:base" select="base-uri($doc)"/> 

<xsl:apply-templates select="@*|node()" mode="#current"/>

</xsl:copy>

</xsl:when>

<xsl:otherwise>

<xsl:apply-templates select="." mode="#current"/>

</xsl:otherwise>

</xsl:choose>

</xsl:for-each>

</xsl:template>

I wanted to preserve any comment/PI nodes outside the root element of the inlined document, and I couldn't think of a more elegant way of doing that than the code above.

I hope this helps someone who needs to do something similar!
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