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.
xmlwriter
Only for procedural calls. The XMLWriter resource that is being modified. This resource comes from a call to xmlwriter_open_uri() or xmlwriter_open_memory().
name
The DTD name.
publicId
The external subset public identifier.
systemId
The external subset system identifier.
subset
The content of the DTD.