.
While I applaud your post, your models do not yet identify what a "wiki" is. The model also states that a page contains only sections -- that needs some refinement.
I think a "wiki" is a collection of articles and documents, a document itself being a collection of articles. (Incidentally I prefer "story" to "article" so as to distinguish from grammatical and other uses of "article" and it gives a clear path to tie into emerging argumentation models.)
A wiki "story" then is composed of one or more pages. I then look to XSL for the definition of a page, which divides rendition into repeatable header/footer areas & a body area. (In this regard, you can use "heading" or "caption" in the manner that you now seem to use for "header"). A "subpage" is another matter altogether, for its existence is functionally dependent on that of a superordinate page; a subpage often has overflow content from its superpage but it could be an earlier version of the superpage; in other words, a subpage contains material that is effectively attached to another page.
A wiki page is a container for content which, because a single story can be spread across multiple pages, means a single page may contain only part of a story. Page content can be of many varieties, e.g., paragraphs, tables, and lists. Many documents contain titled and sequentially-numbered sets of paragraphs & subsections which we both would call a "section" (as XHTML 2.0 does).
A document is often divided into front-matter, body, and back-matter; I don't believe that a story is similarly divided. Thus the body of a page for a story within a document may be the container for content that is part of one of these three document divisions.
Some of these concepts are perhaps better represented in a 'semantic page structure' as follows:
| legend: | :: is-a | : has-a |
wiki : document* story*
document : story+ division+
division :: frontmatter | bodymatter | backmatter
division : story+ block*
story : page+
page : layout* subpage* ordinal
layout :: header | body | footer | sidebar
layout : caption? block* column* ordinal
block :: division | section | line |
heading | graf | list | hr |
table | preblock| bquote
block : block* flow* ordinal
section : heading? graf* footnote* comment*
heading : seq_label title
seq_label : seq_label* sep designation
designation :: prefix? (number* | letter*) suffix?
list :: ul | ol | dl | ilist
list : list_item
list_item :: ordered_ | unordered_
list_item : block* flow* ordinal
ordered_ : heading
table : topcaption? theader? tbody* tfooter?
bottomcaption? ordinal
flow :: link | em | strong | img | br | ...
styled_ | annotated_ | inserted_ |
struck_ | imported_ | calculated_ |
footnoted_ | redacted_ | queried | ...
flow : flow* pcdata
-- John McClure
Inline nowiki and monospace can be totally distinct in Creole (triple-braces for nowiki and double-sharps for monospace).
-- YvesPiguet, 2008-Sep-16