1. <instance>
- <instanceIdentifier> (NR): This is a system-generated unique identifier for the instance document in the ole-docstore.
- <resourceIdentifier> (R) : This is the unique bibliographic identifier for the source bibliographic record.
- <formerResourceIdentifersformerResourceIdentifer> (R) : These are the bibliographic record identifiers. If the source is a marc record, then its the 035 field value in the marc record. These identifiers are used when linking instance documents with the appropriate bibliographic records in OLE after the legacy data migration.
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