Namespace Handling in Model Provider Class

Hi,

Could you help me understand the namespace handling mechanism in Model Provider Class.I was trying to refer to the below mentione link.But unable to proceed much on the same.

Namespace Handling in Model Provider Class - SAP NetWeaver Gateway - SAP Library

Could you let me know what would need to be done in the methods  /IWBEP/IF_MGW_VOCAN_ANN_TARGET~SET_NAMESPACE_QUALIFIER,

/IWBEP/IF_MGW_ODATA_MODEL~SET_SCHEMA_NAMESPACE.

Also could you guide me on how to test the service,I was trying to test from gateway client.But unable to find out any thing specific to namespace handling.

Regards,

Ann