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Xmltask tangled up in dtd

I am trying to use xmltask for ant to modify a file in a subdirectory:

project/path/to/file.xml

The file refers to the DTD as follows:

<!DOCTYPE data SYSTEM "mydtd.dtd">

I do not have the flexibility to modify these documents.

This DTD is stored in the same subdirectory, which always worked fine:

project/path/to/mydtd.dtd

Unfortunately, xmltask is trying to find dtd in my top-level directory of the project, where my build file is located, and where I run from:

[xmltask] java.io.FileNotFoundException: /home/me/project/mydtd.dtd (the system cannot find the specified file)

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OASIS ( spec ) :

<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">      
  <system systemId="mydtd.dtd" uri="project/path/to/mydtd.dtd"/>
</catalog>

<XmlCatalog>:

<xmlcatalog refid="commonDTDs"/>
  <catalogpath>
    <pathelement location="path/to/oasis.catalog"/>
  </catalogpath>
</xmlcatalog>

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<!DOCTYPE data SYSTEM "./path/to/mydtd.dtd">

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<target basedir="path/to" ...>
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<!DOCTYPE opencms SYSTEM "http://www.opencms.org/dtd/6.0/opencms-modules.dtd">

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I ended up using this workaround: I commented on the definition of doctype using the Ant task replace, ran it xmltask, and then returned the doctype to the file.

<replace file="myxmlfile.xml">
    <replacetoken>&lt;!DOCTYPE opencms SYSTEM "http://www.opencms.org/dtd/6.0/opencms-modules.dtd"&gt;</replacetoken>
    <replacevalue>&lt;!-- !DOCTYPE opencms SYSTEM "http://www.opencms.org/dtd/6.0/opencms-modules.dtd" --&gt;</replacevalue>
</replace>

<xmltask .../>

<replace file="${local.opencms.webapp.webinf}/config/opencms-modules.xml">
    <replacetoken>&lt;!-- !DOCTYPE opencms SYSTEM "http://www.opencms.org/dtd/6.0/opencms-modules.dtd" --&gt;</replacetoken>
    <replacevalue>&lt;!DOCTYPE opencms SYSTEM "http://www.opencms.org/dtd/6.0/opencms-modules.dtd"&gt;</replacevalue>
</replace>
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