Possible extensions to RELAX NG

In talking to James Clark earlier today about the relationship between RELAX
NG and the proposed new ISO Document Structure Definition Language (DSDL)
James asked if I could provide some use cases that would justify the initial
set of requirements that the DSDL proposal contained. The attached document
starts by listing the requirements identified as being essential for DSDL,
and then provides a set of use case statements that seeks to justify each
requirement. It also contains brief use cases for supporting three optional
features of SGML that are not supported by XML, and not listed as being
requirements for DSDL, but for which cases can be made within data streams
being used by businesses.

Martin Bryan
The SGML Centre