From: Phillip J. Eby <pje@telecommunity.com> [snip description]
The effective external behavior of these two attributes, would be to let a web designer load and save any page or template they wished in the site, freely making changes to the header, footer, or various embedded elements thereof, and then save that *one* page, and have those style changes propagated throughout the relevant areas of the site.
Exactly. You've just described the "components" aspect of this idea, which was left out of the Paul's original post. A component is just a tag marked with a special attribute that names it (and its path, if it has been saved). It can contain other components, and can have "slots" -- subtags whose contents are not part of the component. There is also the concept of "modes", which allows you to have different versions of a template for different system states (shopping cart empty vs. non-empty) that radically affect presentation.
This could potentially be a "killer feature" for web designers.
Yep :-) Cheers, Evan @ digicool & 4-am