6.3 Data Entities a. Substantial rewrite is required and design must be tied to groves. Note that this markup will blur the distinction between an empty element and one with zero-length content. This may be broken. It will be discussed.
Additional explanation is needed.
7.6 Content a. The current rules, however, simplify implementation of an SGML-aware text editor because there is no need for long trial changes of parsing state. Record Boundaries a. REs that are ignored shall not affect conformance to the content model. Other questions and discussion can be found in N1875.