`#ChainLink`

Asserts opda:TransactionChain in the RML mapping.

JSONPath iterator	`$.chain.onwardPurchase[*]`
Subject template	`https://opda.org.uk/pdtf/harness/data/transactionchain/onwardPurchase/{transactionId}`

No predicateObjectMap rows — a class-assertion-only node.

#ChainLink