Class OccurrenceType (2.24.2)

Types of occurrences of the entity type in the document. This represents the number of instances, not mentions, of an entity. For example, a bank statement might only have one account_number, but this account number can be mentioned in several places on the document. In this case, the account_number is considered a REQUIRED_ONCE entity type. If, on the other hand, we expect a bank statement to contain the status of multiple different accounts for the customers, the occurrence type is set to REQUIRED_MULTIPLE.

Values: OCCURRENCE_TYPE_UNSPECIFIED (0): Unspecified occurrence type. OPTIONAL_ONCE (1): There will be zero or one instance of this entity type. The same entity instance may be mentioned multiple times. OPTIONAL_MULTIPLE (2): The entity type will appear zero or multiple times. REQUIRED_ONCE (3): The entity type will only appear exactly once. The same entity instance may be mentioned multiple times. REQUIRED_MULTIPLE (4): The entity type will appear once or more times.