xml2schema

[uche.ogbuji at gmail.com]

"""
Er, do you mean to generate a Relax NG (or possibly a DTD in fact) from
some XML file??

If you do mean this then just think of that how you could generate
grammar from some paragraphs of English text...  Sorta non-trivial, if
possible at all, isn't it? :-)
"""

Very well put.  However, for RELAX NG there is a tool that might work
for the OP: Examplotron.  See:

http://www-128.ibm.com/developerworks/xml/library/x-xmptron/

As I show in that article, you can use Examplotron from any XSLT
processor, including one invoked through Python API.

-- 
Uche
http://copia.ogbuji.net