anchor.diff:  * UberFire Servlet
   ** App template, header template, footer template, user data template
   * FileUpload Servlet
  ++
  +Servlet that provides file upload capabilities for binary related `Editor` 's.
   * FileDownload Servlet
  -TODO
  ++
  +Servlet that provides file download capabilities for binary related `Editor` 's.
   
   UberFire Widgets Concepts
   ~~~~~~~~~~~~~~~~~~~~~~~~~
  
positive.code: ** Panel definitions
  ** Part definitions
  
  TODO
  
  UberFire Metadata Concepts
  ~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  
negative.code: 
  The `uberfire-widgets-properties-editor` module introduces the following concepts:
  
  * Properties Editor Widget
  +
  TODO
  * PropertyEditorCategory
  