Provide methods for retrieving tracking information.

The following operations are supported. For a formal definition, please review the Service Description.

• Track
  Accepts an XML string as input and returns the results as an XML string. For more information, please look at the documentation in the doc directory.
• TrackCDATAWrapped
  Accepts a a CDATA wrapped XML string as input and returns the results as a CDATA wrapped XML string. For more information, please look at the documentation in the doc directory.