CHAPTER 2 CONFIGURING DRUPAL Tip The Tagadelic module (http://drupal.org/project/tagadelic) shows free tagging tags in the style made famous by Flickr (http://www.flickr.com/photos/tags/), with each tag s size adjusted to the number of posts associated with it. Hierarchy: If your terms are to appear in a flat list, then the Hierarchy field should be Disabled. If child terms should have only one parent, choose Single. Single represents a one-to-many relationship between a parent and its children. If terms should be able to have multiple parents, choose Multiple. This represents a many-to-many relationship between parents and children (child terms can have many parents). Multiple select: This allows you to assign more than one term to content. This is useful if you want the content to appear in more than one category list. Free tagging categories are always multiple select and will take care of this detail for you. Required: If the vocabulary is set as Required, users will be forced to select at least one term from it when they create content. The option will disappear from vocabulary selection boxes on the content creation forms. Weight: This determines the order in which vocabularies are listed on the admin/taxonomy page, as well as the order in which they are presented in the content creation forms. As is customary, larger numbers move toward the bottom and smaller numbers go toward the top. Now your vocabulary has been created and configured. If it is a free tagging vocabulary, your work is finished, as users and content creators will provide the actual terms, or tags. For other vocabularies, the next step is to make the list of terms and, if appropriate, determine the hierarchy. Adding Terms To see an overview of a vocabulary s terms, select administer . categories . edit terms for the appropriate vocabulary. Alongside the list of existing terms is an Add Term tab, which brings you to the page for adding terms. The important fields here are Name and Parents. The name is what the user will be presented with in the selection box when choosing categories, and the Parents setting determines the hierarchy of the terms within the vocabulary. The Description and Synonyms fields are virtually unused by core modules and can be left blank most of the time. The Weight setting controls the placement of the term in the list of terms belonging to that vocabulary. When you click Submit to create a new term, you will be returned to the page for adding terms, to facilitate adding many terms quickly and easily. Leveraging Categories with Custom URLs Drupal offers a very special tool for querying content based on categories using the URL or Drupal path. It enables you to construct a path to get a list of content in one or more categories and display the list either as a normal page or as an RSS feed. It allows for Boolean AND
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