V.A.2. Content-Incorporated [Optional*]
Contains identifiers of records incorporated into the content or the actual data contained in these records.
I.A.2. Transaction-Domain-Identifier [Mandatory]
Uniquely identifies the domain from which the record originated with sufficient specificity to identify the transaction-type and the organization responsible.
I.A.3. Transaction-Instance-Identifier [Mandatory]
Uniquely identifies a transaction instance with date, time and necessary sequence identifiers.
Identifies each file that makes up the record. This affords the ability for the system to bring together all of the parts to form the whole.