As an extensible, easy to use, open source tool Schematron is an extremely useful addition to the XML developers toolkit.
The initial section of this paper conducts a brief overview of tree pattern validation, and some of the advantages it has in comparison to a regular grammar approach.
An overview of the architecture, with a view to producing customised versions is also provided.This free Java regular expression tester lets you test your regular expressions against any entry of your choice and clearly highlights all matches. Consult the regular expression documentation or the regular expression solutions to common problems section of this page for examples. You can create range of characters using the hyphen character such as A-Z (A to Z).If you need more examples or solutions, please contact me. Note that in character sets, special characters (., *, ) do not have any special meaning. This means match anything that is a single white space character OR anything that is not a white space character!Schematron is a useful and accessible supplement to other schema languages.The open-source XSLT implementation is based around a core framework which is open for extension and customisation.