But DOCTYPE requires a DTD.
That is a tautology though, the DTD is that that is referenced by the
doctype.
It doesn't require an external file and it doesn't require that
all elements are declared.
<!DOCTYPE a [
<!ATTLIST b x ID #IMPLIED>
]>
<a>
<b x="z"/>
</a>
is a well formed document and the element b has ID z.
David
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