Import cXml dtd

Question

We downloaded cxml 1.2 dtd from cxml.org and tried to import into XI external def.  We imported cxml.dtd and received no errors.  When accessing from message mapping and Message Type we are unable to import/select cXml dtd structures/messages.
How do we import cXml dtd message into XI?
We have tried to convert to a .xsd file using Xml Spy and are experience namespace errors.

Answer 1

Hi Frank,
concerning namespaces the philosophies of DTD and XSD are not compatible (indeed the philosophy of DTD is not compatible with that of XML namespaces itself). As XI is completely XSD-based it is not able to deal with DTDs containing namespace information, although they are well-formed.
Other tools (like XMLSpy) may try to make a conversion anyway (on a somehow heuristic basis). The result of that maybe imported as External Definition, but sometimes it is necessary to make some adjustments to the XSD.
According other DTDs coming from cxml I cannot tell you, because I do not know. Anyway, the namespace information is an important information which cannot be left out. If the XML structure defined by cxml really uses xml namespaces, then DTDs are not a suitable way to describe this structure (as explained above). XML structures with namespaces should always be described using XSD.
Greetings Stephan