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A property is some aspect of a resource that can be described. For example, location and operation-count could be properties
of a switch. When properties appear in queries they are represented by the type PropertyID. However, a property is itself
a resource and PropertyID is defined as a ResourceID.
A property has a domain, which is the set of resources to which it applies and a range, which is the set of values it can
take. Associations between resources are created by properties whose range, like the domain, is a set of resources. For example,
the location property might associate a switch with the substation in which it is located.