set usexsdasdtd= { on | off}

This set option provides a means to migrate a document instance from a DTD to an XML Schema.

If set to on, an instance with a DOCTYPE declaration resolving to a .dtd file will instead be parsed against the XML Schema if there is a .xsd file with the same base name as the .dtd in the document type directory. In this case, the ISO standard character entities will automatically be converted to the equivalent Unicode characters. Character entities that cannot be converted will be flagged as undefined entities because an XML schema cannot declare entities.

The default is off. This option has no effect for SGML document types.