function PROPERTY_ACCESS(fnLeft, fnName, aParts, oReference) {
		var oParent = fnLeft(aParts),
			sIdentifier = fnName(aParts), // BEWARE: evaluate propertyNameValue AFTER baseValue!
			vChild = oParent[sIdentifier];

		if (oReference) {
			oReference.base = oParent;
		}
		return clean(vChild);
	}
Formatter function for a property access.
@param {function} fnLeft - formatter function for the left operand: the array or object to
  access
@param {function} fnName - formatter function for the property name
@param {any[]} aParts - the array of binding values
@param {object} [oReference]
  optional side channel to return the base value (left operand) of the reference
@return {any} - the array element or object property