Normal forms

Another suggestion.

It might be worthwhile being able to declare that the
elements and data inside an element should be treated as
atomic, as a normal form. This would help relational implementations.

For example, to say that the following instance:

<example>
    <name><img src="prince.gid"/></name>
    <formula>1<sub>2</sub></formula>
</example>

the name and formula element types should be treated as atomic.
The database should store the contents as well-formed XML entity:
<img src="prince.gid"/>
and
1<sub>2</sub> 

Rick Jelliffe