DTD for RDF? How is that possible?

Roger L. Costello costello at mitre.org
Wed May 5 13:40:38 BST 1999

I recall seeing a posting a few months back where someone posted a DTD
for RDF.  Upon reflection I find this puzzling.  How could you possibly
create a DTD for RDF?  By definition, the child elements in
rdf:Description are arbitrary:

<!ELEMENT rdf:RDF (rdf:Description)*>
<!ELEMENT rdf:Description (???)*>

It is my understanding that RDF documents can only be "well-formed". 
There is no such thing as a "valid" RDF document.  Correct?  /Roger

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