Object oriented style:
class XMLWriter {Procedural style:
bool xmlwriter_write_dtd ( resource xmlwriter, string name [, string publicId [, string systemId [, string subset]]] )Writes a full DTD.
xmlwriterOnly for procedural calls. The XMLWriter resource that is being modified. This resource comes from a call to xmlwriter_open_uri() or xmlwriter_open_memory().
nameThe DTD name.
publicIdThe external subset public identifier.
systemIdThe external subset system identifier.
subsetThe content of the DTD.