Cleaning out my Opera tabs I came across two tabs that I had been meaning to post about while working on my last Web Programming assignment.
The first one is a very handy validator for validating XML against its DTD. If you’re writing a custom DTD file you will need to make sure the DTD file is uploaded somewhere on the web where the script can access it to compare against the XML, otherwise it should work against already publicly available DTDs.
http://www.stg.brown.edu/service/xmlvalid/
The second tab is simply a great XML and DTD reference website.