Parameter Handling 

One of the key features of the content provider framework is that it simplifies the setting of parameters that are used to create the HTTP or SOAP request that retrieves the XML content.

When a parameter can be retrieved from several sources, a mechanism must be created to retrieve the value from the correct location. The ISourcePropertiesHandler interface provides this mechanism. Each HTTP and SOAP entity is assigned an ISourcePropertiesHandler object to handle the retrieval of its parameters.

You can create an ISourcePropertiesHandler object with the default implementation with the help of the content provider utility service. This default implementation searches for parameter values in the following order:

...

       1.      Drag&Relate value

       2.      Request query string

       3.      Page Context

       4.      Personalized value

       5.      Value defined in iView

       6.      Value defined in portal component (portalapp.xml)

For more information on where these parameters are set and how the parameters are retrieved, see Parameters and Constants.