function updateProperty(sPropertyName, vValue) {
		var oMutators = getMutators.call(this, sPropertyName);
		var vCurrentValue = oMutators.getValue();
		if (vCurrentValue !== vValue) {
			oMutators.setValue(vValue);
		}
	}
Converts properties of the flex object to the file content format according to the mapping info.
@returns {object} File content of the flex object that can be persisted