In Drupal, taxonomy.module implements hook_term to provide links among content which shares a given term. Site builders often use this feature to provide indexes and RSS feeds of their content.
Taxonomy.module's purpose is to support the creation of controlled vocabularies which we can use to classify our site's content. If taxonomy.module were a prescription drug, this would be its "on-label" or indicated use. Using taxonomy.module vocabularies and terms to store essential data about our content is what I call an "off-label" use. You're not really creating a controlled vocabulary, and the term-node relationship in these cases isn't always classificatory.
However, a clever web developer will use the tools that get the job done, and often taxonomy.module is the perfect tool for making this happen. Because this information is essential to your node's content, CCK fields are indicated for this use. However, CCK fields don't have built-in linking among nodes which share values for the same field. Also absent is any built-in RSS feed for a CCK field's value. This requires some theming and Views.
Scott Blackburn on 10 Feb 09One annoying aspect though is that almost all Drupal files use CVS style tags, such as the $Id$ one. Subversion does not recognize these by default. However, there is a way to make Subversion recognize these tags. This post describes the steps needed to achieve this goal.
