Datatypes for DTDs (DT4DTD)

This could be very helfpul. Lets you declare datatypes in XML DTDs, obviously enriching any data scheme formalized by a DTD. This isn't for free as, I assume, validating parsers will have to take account of these datatypes.

This is targetted at applications that cannot use XML Schema, but I suspect it will get used by people, like me, who know DTD syntax well, but haven't learned XML Schema yet.

Java code available at www.extensibility.com/dt4dtd.