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Reply to: Unusual problem with XMetal and specialized DITA DTDMarch 6, 2012 at 12:39 pm
It is probably because C:Program FilesXMetaL versionAuthorDITADITA_OT_DTDcatalog-dita.xml does not have an entry for your specialized DTD.
When you open a specialized DITA topic that specifies a dtd like “mydtd.dtd”, XMetaL will first look in the current folder for the DTD. If it doesn't find the DTD there, it will consult the catalog file to determine the DTD location, using a “public identifier” to determine the topic type (you'll see the public IDs when you open the file).
If you update the catalog file with the DTD information, you should be fine.