src/sap.ui.core/src/sap/ui/model/odata/v2/ODataTreeBinding.js
function(sKey, sPath) {
			oContext = that.oModel.getContext('/' + sKey);
			return that.oModel.getProperty(sPath, oContext);
		}
function(sKey, sPath) {
			oContext = that.oModel.getContext('/' + sKey);
			return that.oModel.getProperty(sPath, oContext);
		}
function ( sKey , sPath ) { oContext = that . oModel . getContext ( '/' + sKey ) ; return that . oModel . getProperty ( sPath , oContext ) ; }
retrieves the sort value
retrieves the sort value