Is there a way to validate external file references?

[mgentry]

Is there a way in Oxygen to make sure references to external files match an existing filename? For example, if I have a tag:

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<graphic mime-subtype="png" xlink:href="figure6.11-1.png"/>

...I'd like Oxygen to automatically check a specified directory and see if a file named "figure6.11-1.png" actually exists; and if it doesn't, throw up a warning.

Thanks in advance for any tips.

[Radu]

Hi,

You can create a Schematron schema to validate an XML document with custom validation rules.
For example if your XML document looks like this:

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<?xml-model href="test.sch" type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?>
<root>
    <graphic mime-subtype="png" href="images/figure6.11-1.png"/>
</root>

you could create a "test.sch" Schematron schema next to it:

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<sch:schema xmlns:sch="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2"
    xmlns:sqf="http://www.schematron-quickfix.com/validator/process">
    <sch:ns uri="java:java.io.File" prefix="java-file"/>
    <sch:ns uri="java:java.net.URI" prefix="java-uri"/>
    <sch:pattern>
        <sch:rule context="*:graphic">
            <sch:assert test="java-file:exists(java-file:new(java-uri:new(resolve-uri(@href))))"> <sch:value-of select="resolve-uri(@href)"/> document should exist.</sch:assert>
        </sch:rule>
    </sch:pattern>
</sch:schema>

In the Oxygen Preferences->"XML / XML Parser / Schematron" page there is a "Disable Schematron security checks" setting which needs to be enabled.
Then you can validate the XML document and the Schematron scheck should be applied on it.
Schematron schemas can also be associated with the XML document using validation scenarios so it is not necessary to refer directly to the Schematron inside the XML file.

Regards,
Radu