Referencing multiple DTD in an XML document

Andrew Layman andrewl at
Mon Nov 1 17:45:14 GMT 1999

A DOCTYPE cannot directly reference more than one DTD file.  To use several
such tags, you must either combine them in a single DTD, or use a schema
notation that supports such combination via namespaces, e.g. the XMLDR
schema notation currently in the Microsoft MSXML parser or the schema
notation under design at the W3C.  See and

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