Hi Jon,

Trang can take as input a set of XML files and you can get as output 
DTD, Relax NG or XML Schema.
http://www.thaiopensource.com/relaxng/trang.html

oXygen uses Trang and provides a GUI for it
www.---.com

Best Regards,
George
---------------------------------------------------------------------
George Cristian Bina - http://aboutxml.blogspot.com/
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
www.---.com


Jon Noring wrote:
> Everyone,
> 
> Several of us involved with Distributed Proofreaders and Project
> Gutenberg are analyzing a number of TEI documents representing PG
> etexts.
> 
> As part of the analysis, we'd like to find an application which will
> autogenerate a minimal DTD (or schema) for validating a given set of
> documents sharing the same root element.
> 
> I have seen several applications which will autogenerate a DTD for a
> single XML document, but have not yet found one which will generate a
> DTD representing a set of XML documents.
> 
> Of course, we prefer a "free" application for this one-time job, but
> if there's a good commercial package, hopefully we can find someone
> with a copy who'd be happy to volunteer running the job for us.
> 
> Thanks in advance.
> 
> Jon Noring
> 
> 
> 
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