Delta Query

Hello Experst,

How to develop delta query in SAP Gateway, we want to bring last changed data.

I am referring this URL http://help.sap.com/saphelp_nw74/helpdata/en/19/a426519eff236ee10000000a445394/content.htm

but i don't know where to use this code and how my oData query stream will look like.

Please Suggest

Regards

Manish

http://help.sap.com/saphelp_gateway20sp06/helpdata/en/2e/d7d9ee0f0f4c3292a555ec1c2952b1/frameset.htm