It is this issue that must first be addressed. This work began with a review of the differientiators between XML and SGML by Dianne Kennedy. Evan Owens pointed out that decisions must be made that will most likely make the XML version incompatible with existing SGML data. The group reached concensus that this was unavoidable. Since it seems clear that technology trends will mandate XML compatible data, providing guidelines and a target seems not only appropriate but responsible.
Most publishers use transformations routinely in their day to day work.
Hence a decision had to be made about the exclusions. There were 2 approaches to remedy this problem. That is, the user would have to take responsiblity for the proper use of elements. It would complicate the DTD to add a host of new elements just to prevent the use of floats within floats. This would not make existing data invalid.