Hi Wayne,
By default Oxygen looks at the DOCTYPE Public ID specified in the DITA XML documents (topics/tasks/concepts, and so on) and tries to map them through the configured XML catalogs to DTD locations on the local disk.
For DITA the catalog which does all this mapping is:
OXYGEN_INSTALL_DIR/frameworks/dita/DITA-OT/catalog-dita.xml
If you look inside it, it contains mapping like this:
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<public publicId="-//OASIS//DTD DITA Topic//EN" uri="topic.dtd" xml:base="dtd/technicalContent/dtd/"></public>
but it also contains mappings like:
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<public publicId="-//OASIS//DTD DITA 1.1 Topic//EN" xml:base="plugins/org.dita.specialization.dita11/dtd/" uri="topic.dtd"/>
So your options would be:
1) All your DITA XML topics could have the DOCTYPE something like:
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<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA 1.1 Topic//EN" "http://docs.oasis-open.org/dita/v1.1/OS/dtd/topic.dtd">
As seen in the catalog-dita.xml this would map them directly to the DITA 1.1 DTDs.
The equivalent should be done for tasks/concepts, so on.
2) You make modifications in the
catalog-dita.xml which add near its top mappings like:
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<public publicId="-//OASIS//DTD DITA 1.1 Topic//EN" uri="topic.dtd" xml:base="dtd/technicalContent/dtd/"></public>/>
3) In the Oxygen Preferences->"XML / XML Catalog" page you add your custom XML catalog (which will have higher priority than the catalog-dita.xml) which again maps those public IDs to the DITA 1.1 DTDs.
Regards,
Radu