Validating dtd

XML schema is supported in a similar way, but requires an explicit schema to be provided: As described above, the parser support for DTDs depends on internal or external subsets of the XML file.

Hi, I am using Oxygen 13.2 and am going though some DITA tutorials that use DTDs.It defines the document structure with a list of legal elements and attributes.A DTD can be declared inline inside an XML document, or as an external reference., newer XML namespace-aware schema languages (such as W3C XML Schema and ISO RELAX NG) have largely superseded DTDs.A namespace-aware version of DTDs is being developed as Part 9 of ISO DSDL.DTDs persist in applications that need special publishing characters, such as the XML and HTML Character Entity References, which derive from larger sets defined as part of the ISO SGML standard effort.

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