Where can I find the official DTD specification [closed]

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Where can I find the official DTD specification? Unlike say XPath and XML Schema, I cannot seem to find specification for DTD on the W3C web page, nor did I manage to find it via google.com.

Answer 1

It's part of the XML specs. You can find them here.

Depending on your needs, and for completeness' sake: The DTD definition from the XML specs is a subset of the DTD definition that's part of SGML (ISO 8879:1986), which Quentin already referenced in his answer.

Answer 2

I believe it is part of ISO 8879:1986, which is available for a fee.