The Saxon DTDGenerator only handles one input document, but I've used it for
this scenario in the past, simply by concatenating all the documents within
a dummy root element, generating the DTD, and then discarding the dummy root
element definition. (It doesn't need to be a physical concatenation, you can
set up a document that brings all the others in as external entities).

I produced a new version of the DTDGenerator a couple of weeks ago, as it
happens - the first release for 6 years, fixing a bug that caused it to
slowly eat memory in proportion to the number of distinct attribute values.
After fixing that, I was able to process 20Gb of input in about 25 minutes.
It's available as a free-standing download from the Saxon project on
sourceforge.

Michael Kay
http://www.saxonica.com/ 


> -----Original Message-----
> From: Jon Noring [mailto:jnoring@g...] On Behalf Of Jon Noring
> Sent: 06 October 2007 21:10
> To: xml-dev@l...
> Subject: [xml-dev] Auto-generate a DTD from multiple XML documents?
> 
> 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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