fnSuccess = function(sData, sStatusText, oXHR) {
				mSource.xml = oXHR.responseText;

				if (oXHR.getResponseHeader("Last-Modified")) {
					// no need to use UI5Date.getInstance as only the UTC timestamp is relevant
					mSource.lastModified = new Date(oXHR.getResponseHeader("Last-Modified"));
				}

				if (oXHR.getResponseHeader("eTag")) {
					mSource.eTag = oXHR.getResponseHeader("eTag");
				}

				fnResolve(mSource);
			}
Loads a source with the type "url" and returns a promise that resolves if the source was successfully loaded or
rejects in case of failure.

@param {sap.ui.model.odata.v2.ODataAnnotations.Source} mSource The source of type "url" to be loaded
@returns {Promise} The Promise to load the source
@private