And Yes I have Solved this problem by taking a very good rest before reading the documentation
Remember to do a forced clear cache especially in Chrome
The correct URL should be
http://server/Sentiments/services/contacts.xsodata/ContactsList('1')
code
var oModel = new sap.ui.model.odata.ODataModel("http:/mySecretIP/Sentiments/services/contacts.xsodata",false);
oModel.remove("/ContactsList('1')", null, function(){
alert("The Delete successful");
},function(){
alert("The Delete failed");});
Where contacts.xsodata is the name of .xsodata definition file
and /ContactsList is the alias name you gave to your database, view or datasource if you are using HANA
Hope this help me in the future or you presently