MediaWiki is a great system.

See also: WikiData

additional features we want:

• meta variables on pages
• stereotypes
• changeable icons per page
• better InterWikiWiki interwiki with content transfer / show referneces to multiple wikis, all searched in parallel
• implementation in SQL database backend instead of PHP / better article parser/compiler architecture
• marked up sections in nested containers
• file manager

• editor
  • link lookup
  • media lookup
  • XUL interface: source/preview tabs

experiments:

• writing a MediaWiki grammar for use with Parse::RecDescent.

<graphviz> digraph a {

 rankdir=LR;
 node [shape="box"];
  title;
  type;
  parser;
  configuration;
  user;

 node [shape="house"];
  title->url
  title->namespace;
  title->args;
  title->label;
  type->storage;
  type->display;
  type->linking;
  type->transclusion;
  parser->cache;
  storage->versioning;

 edge[arrowhead="empty"];
 node [shape="box"];
   user->type;
   function->type;
   page->type;
   file->type;
   article->page;
   talk->page;
   category->page;

} </graphviz>

Links:

• http://meta.wikimedia.org/wiki/Help:Editing
• http://meta.wikimedia.org/wiki/Help:Table
• http://meta.wikimedia.org/wiki/Help:Formula
• discussion about InterWiki exchange format