DOCBOOK: DocBook DTD version in FrameMaker 6.0+SGML (unix)

[Gene Hirayama]

Does anyone know what version of the DocBook DTD comes
with Adobe FrameMaker 6.0+SGML (Unix)? 

My guess is version is v3.0 because some elements
listed in the DocBook Reference v3.1 aren't present
(e.g., constant).

Thanks for your help,
Gene 

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