Property(mapping=None, *, ignore_unknown_fields=False, **kwargs)
Defines properties that can be part of the entity type.
The name of the property. Follows the same guidelines as the EntityType name.
A reference to the value type of the property. This type is subject to the same conventions as the
Occurrence type limits the number of instances an entity type appears in the document.
Types of occurrences of the entity type in the document. Note: this represents the number of instances of an entity types, not number of mentions of a given entity instance.
Values: OCCURRENCE_TYPE_UNSPECIFIED (0): Unspecified occurrence type. OPTIONAL_ONCE (1): There will be zero or one instance of this entity type. OPTIONAL_MULTIPLE (2): The entity type will appear zero or multiple times. REQUIRED_ONCE (3): The entity type will only appear exactly once. REQUIRED_MULTIPLE (4): The entity type will appear once or more times.