The element <zoneSpec> contains the associated properties of one zone.Some properties of the zone can vary from one product instance to another. Such properties are managed under the zone alternates (element <zoneAlts>), which can contain a reference to an applicability annotation. Refer to Chap 4.13.3 for details on the alternates concept.For some properties appearing at both levels, the following rule must be applied: if the property is fulfilled in the alternate element, it supersedes the generic value stored in the parent element.