The zwiki implementation of wiki has a nice structuring feature (see the discussion of this feature at the zwiki site [http://joyful.com/zwiki] and an example at the Zope site [http://www.zope.org//Wikis/DevSite/Proposals/WikiNG]).  This structuring feature allows parent and child relationships to be modified on the backlinks page.  Each reference to a page are listed with checkboxes.  A checked checkbox indicates the page is actually a parent.  The page from which another page is created is by default a parent.  This default can be overridden by toggling the checkboxes on the backlinks page

Here is a simple version of this concept for Wikit where all the references to a page treated as a parent and the parentage cannot be changed.  The following code uses the graph struct from tcllib:
 # Returns a graph containing the wiki page ids as nodes with
 # arcs connecting parent nodes to child nodes
 proc wikiRefsToGraph {} {
    set graph [graph]

    # Add each nonempty page to the graph (empty pages have date of 0)
    foreach pageId [mk::select doc.pages -min date 1] {
       if {![$graph node exists $pageId]} {
           $graph node insert $pageId
           }
       set refs [mk::get doc.pages!$pageId refs]
       foreach ref $refs {
           if {![$graph node exists $ref]} {
               $graph node insert $ref
               }
           $graph arc insert $ref $pageId
           }
       }
    return $graph
    }

 # Returns an html tree form of the given graph beginning with 
 # the optionally given node id as the root.  A node's children
 # are only displayed the first time the node is encountered.
 # After that "..." is appended to the node name
 proc getHtmlTreeFromGraph {graph {node 0}} {
    global visitedNodes
    puts -nonewline "<li>[Wiki - $node.html]"
    if {[lsearch $visitedNodes $node] < 0} {
       if {[$graph node degree -out $node] > 0} {
            puts <ul>
            }
        puts ""
        lappend visitedNodes $node
        foreach child [$graph nodes -out $node] {
            getHtmlTreeFromGraph $graph $child
            }
       if {[$graph node degree -out $node] > 0} {
            puts \n</ul>
            }
       } elseif {[$graph node degree -out $node] > 0} {
       puts "..."
       } else {
       puts ""
       }
    }
Here is an example use of this code:
 package require graph
 namespace import ::struct::graph::*
 set visitedNodes ""
 getHtmlTreeFromGraph [wikiRefsToGraph]

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[RA2] I agree with you 200%, Brian. ZWiki is in my view the best wiki of them all, for it creates hierarchical contents we are all used to. Without a hierarchy of some kind, a wiki ends up being well.. let's not be afraid of words...: a ''mess''. 

Zwiki is a more or less a wiki outliner. 

I never thought the backlinks concept (invented by Stan Silver at C2.com) was a hot invention. Of course the backlinks concept is far-out when there is nothing else around! It is better than nothing so we settle for it, the same way we'd settle for an ugly girl until a  gorgeous one shows up. '''All in all, outlines make much more sense!''' And this is what Zwiki does: it is a wiki outline.  

I believe that when an information is structured, it adds value to itself. To the opposite, when an information is not structured, it is worthless. In this regard, your [tkoutline] is marvellous because it is very structured!  

I'd love to try your code if only it could be inserted in a script of some kind. 

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[RA2] I have a good idea for you. Take [tkoutline], modify the code and make it a wiki. And you'll have a winner. If you need details, put the questions on my homepage and I'll explain! [Robert Abitbol]

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[Category Wikit] [Category Package]