function getNormalizedValue(sAlias) {
				if (sAlias in mProperties) {
					return encodeURIComponent(decodeURIComponent(mProperties[sAlias]));
				}
				bFailed = true;
			}
Normalizes the key predicates of a message's target using the sort order from the metadata,
including proper URI encoding, e.g. "(Sector='A%2FB%26C',ID='42')" or "('42')".

@param {string} sTarget
  The message target
@returns {string}
  The normalized message target

@private