CHAPTER 2 CONFIGURING DRUPAL Drupal calls it (Java web server)
CHAPTER 2 CONFIGURING DRUPAL Drupal calls it a single hierarchy. A multiple hierarchy exists when terms can have multiple parents, as illustrated in Figure 2-6. Figure 2-6. Multiple hierarchy example This flexibility allows you to model very complex relationships within a vocabulary. To add to the possibilities, you can create many different vocabularies, and each content type can have more than one vocabulary assigned to it. This allows you to not only categorize your content, but to categorize it in different ways or realms. The hierarchy in Figure 2-7 could be replaced, for example, with two vocabularies: News Area and News Topic. Figure 2-7. Multiple vocabularies example Using these two vocabularies, you could provide very detailed information about every story (or any other content) that you write. Your site could then easily be organized into sections like International News, Regional News, and Local News, each with the subsections Politics, Business, and Travel. Drupal is also capable of listing the content in different categories or combinations of categories based on the information it receives in the URL. This means you can easily make custom sections that display local news about politics simply by entering the correct URL. Category listings even complex listings built from two or more terms have their own RSS feeds, so visitors to your site can easily subscribe to the various categories or channels with their feed reader, without requiring you to program anything. Finally, there are many Drupal modules that use the category system for a wide variety of tasks, such as creating the structure of forums or image galleries, making site navigation menus, providing access control to content, and changing the theme to style different sections of your site differently. As you can see, the category system adds whole new dimensions to what your site can achieve.
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