DOCBOOK: Question regarding DocBook for SGML and XML

Title: Question regarding DocBook for SGML and XML

From my understanding, the DocBook DTD for SGML defines the same set of elements and structure as the DocBook DTD for XML; only one is for SGML and the other for XML. Is this correct?

Moreover, if I create a DocBook SGML document, how close is it to a DocBook XML document? I imagine that, with some modifications/limitations to the SGML document, I'll have a DocBook XML document (just need to change the DOCTYPE).

Any thoughts you have are very much appreciated. 

Thanks for your time,

Ben

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