There are infinitely many schemas that will match any given set of data, so there is no single schema to extract....

If you just want *some* schema under which the document(s) is(are) valid, you could just extract all the element types that occur, say with something like

     grep -o '<[-_.:a-zA-Z0-9]* ' documentname.xml | sort | uniq

and then create a declaration for each one using some global changes in an editor, that allows each one to have unrestricted content. You'd need to do something similar for attributes, but then it should all validate.

If you want a little more information so you can build a more detailed schema, my xmlstats utility (in Perl) at http://derose.net/steve/utilities/xmlstats has options to tell you what element types occur within what other ones, and from that you could derive a more restrictive schema. The most obvious one would be to declare each element to permit the OR of all the element types that ever occur in it; that misses useful restrictions, such as for example that TITLE must occur only once in each DIV, and be the first child element; but it's better than just ANY for everything.

There used to be some nice utilities for extracting a reasonable DTD from SGML documents; perhaps someone has one handy for XML?

Steve

At 7:24 AM +0200 10/20/08, Farkas, Illes wrote:

-- 

Steve DeRose -- http://www.derose.net, email sderose@a...