Controlling Wiki Structure and Fields

[John Lehmann]

I was wondering how an admin (or developer) can control the structure of the wiki pages?  

1. Suppose on my site or perhaps under some subtree on the site I want to have pages with 5 common sections. 

a. Can I "seed" new pages on this area of the site with those sections?

b. Can I enforce that these pages continue to have exactly these sections?

2.  Is there a notion of fields / key-value pairs as opposed to just free text?  Or, is it possible to validate the content of a section?  Suppose a section is a "short answer", essentially an enumeration.  For example, I have a field: "color", and I want to check that they actually choose a color that is known.

thanks!