JSMW PageSchema is a tool to work with and automatically generate Page_Schemas.
This site is heavily using this toolset to structure the content of this site.
See Category:PageSchema for the hierarchy of Categories and Pages that are under the control of this toolset.
With JSMW PageSchema you can adopt a model driven approach to website setup and maintainance. In principle you can create whole "application websites" with this approach.
Structure of a Wiki
Structure of a Semantic Wiki
Structure of SMW PageSchema