anchor.diff:  * Common resources: images, alted images, css, general resources
   * Simple and paged tables: cells, columns, titled cells; sortable headers, sort direction
   * Comparable image resources
  -* A collection of built-in images (gif & png) for corners, pager buttons, dialog status icons, and more (see also UberFire-widgets-core-client)
  -
  -The `UberFire-widgets-core-client` module introduces the following concepts:
  +* A collection of built-in images (gif & png) for corners, pager buttons, dialog status icons, and more (see also uberfire-widgets-core-client)
  +
  +The `uberfire-widgets-core-client` module introduces the following concepts:
   
   * Navigator, Breadcrumb navigator, Tree navigator
   * Explorer
  
positive.code: UberFire I/O Concepts
  ~~~~~~~~~~~~~~~~~~~~~
  
  These concepts are expressed in the `UberFire-io` package,
  which contains mostly server-only code.
  
  * Dublin Core (TM) metadata
  
negative.code: * File Navigators
  * Identity
  * Marshalling
  * Workbench Events (TODO: why are these defined globally rather than in the uberfire-workbench module?)
  ** ApplicationReadyEvent
  +
  Signal when certain resources have been injected into the GWT Host Page and other bootstrap processes complete. Raised by UberFire. 
  