Forms
With Semantic MediaWiki and the Semantic Forms extension, you can easily create any content type in your wiki, and use a form-based interface to edit/modify the content.
For example, at the Creative Commons website, they created a "Case Study" content type. By using the form (or template behind it), you get content like https://wiki.creativecommons.org/wiki/Case_Studies/Cory_Doctorow
Once the content is saved in the wiki, you'll no doubt want to have a way to present that content to users in a friendly way. Take a look at this "overview" page https://wiki.creativecommons.org/wiki/Case_Studies
todo The Creative Commons wiki has changed and you can no longer easily see the details of the templates and methods they use. Build up the examples here for better clarity.