Plugin: parenttag
Author: Louis Paternault
Test page: test

This plugin deals with subtags (e.g. mathematics/calculus). Whenever a page is tagged, it is automatically tagged with its subtags as well: the following directives are equivalent:

[[!tag  mathematics/calculus]]
[[!tag  mathematics mathematics/calculus]]

The taglink directive is changed as well: instead of displaying the leaf of the tag, the full path (up to tagbase configuration option) is displayed, each bit linking to its corresponding page. For instance, directive [[!taglink mathematics/calculus]] creates a link similar to [[TAGBASE/mathematics]]/[[TAGBASE/mathematics/calculus]].