Properties

Properties store individual pieces of information about entities as values. All properties on an entity are inferred from its entity type(s).

Property values (the contents of a property field) can either be required or optional. In either case, marking a property as required or not will be specified on the thing using the property (e.g. the entity type which requires the property) rather than on the property itself.

Property types

A property type is how a property is defined. It can be used by one or more entity types, or other property types. A property type:

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  defines the name of the property;

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  contains an optional description that explains in human-readable terms what that property represents; and

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  contains information about what the property’s value is expected to look like, either through reference to data types or other property types.