In BlueSpice and MediaWiki you can display the category system as a category tree. With the category tree, the user gets an insight into the structure and the yet available categories and articles. To insert a category tree into any wiki page please use the categorytree-tag and one of the existing categories from which the category tree shall start. In this example it is top level
There is also a special page for displaying the category tree – just call up “Special:CategoryTree”. This page provides a form where you can type in the category you want to be shown. You also have the choice whether all pages of the category, only the category (with subcategories if available) or all pages except the files should be shown.
For more detailed information and attributs for the categorytree-tag please have a look at mediawiki.org.