| Content markers | Markers used by theme_mark() and node_mark() to designate content. |
| Default theme implementations | Functions and templates that present output to the user, and can be
implemented by themes. |
| Functions to coordinate long-running operations across requests. | In most environments, multiple Drupal page requests (a.k.a. threads or
processes) will execute in parallel. This leads to potential conflicts or
race conditions when two requests execute the same code at the same time. A
common example of this is a… |
| Image toolkits | Drupal's image toolkits provide an abstraction layer for common image file
manipulations like scaling, cropping, and rotating. The abstraction frees
module authors from the need to support multiple image libraries, and it
allows site… |
| Menu flags | Flags for use in the "type" attribute of menu items. |
| Menu item types | Definitions for various menu item types. |
| Menu status codes | Status codes for menu callbacks. |
| Menu system | Define the navigation menus, and route page requests to code based on URLs. |
| Menu tree parameters | Parameters for a menu tree. |
