Re: Parameterized entities?

From: David Carlisle <d.p.carlisle@gmail.com>
To: Roger L Costello <costello@mitre.org>
Date: Thu, 16 Jun 2022 12:13:13 +0100

Play the video

Basically no, XML entities can not do that.

More generally if you parameterize using xslt/xpath the stylesheet can be aware of that structure whereas entities are a simple pre-filter by the xml parser.

Something like

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:map="http://www.w3.org/2005/xpath-functions/map"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
version="3.0">

<xsl:variable name="files" as="map(xs:string,document-node())">
<xsl:map>
<xsl:for-each select="'arpt','nav','trm'">
<xsl:map-entry key="." select="doc(concat(.,'.xml'))"/>
</xsl:for-each>
</xsl:map>
</xsl:variable>

<xsl:template name="main">
<xsl:sequence select="'arpt is:
', $files ? arpt"/>
<xsl:sequence select="'nav is:
', $files ? nav"/>
<xsl:sequence select="'trm is:
', $files ? trm"/>
</xsl:template>

</xsl:stylesheet>

Produces

$ saxon -it:main en.xsl
<?xml version="1.0" encoding="UTF-8"?>arpt is:
<a/>nav is:
<n/>trm is:
<t/>

given suitable input xml files

On Thu, 16 Jun 2022 at 11:33, Roger L Costello <costello@mitre.org> wrote:

Hi Folks,

Is there any way to express a parameterized ENTITY?

Example: I'd like to write something like this:

<!DOCTYPE xsl:stylesheet [
<!ENTITY file(f) "<xsl:variable name=f select='doc(f)'/>">
]>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
&file('ARPT.XML');
&file('NAV.XML');
&file('TRM.XML');
</xsl:stylesheet>

And have the XML parser perform the entity substitutions to generate this:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:variable name='ARPT.XML' select="doc('ARPT.XML')"/>
<xsl:variable name='NAV.XML' select="doc('NAV.XML')"/>
<xsl:variable name='TRM.XML' select="doc('TRM.XML')"/>
</xsl:stylesheet>

Is there any way to do something like this?

/Roger

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References:
- Parameterized entities?
  - From: Roger L Costello <costello@mitre.org>

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