ORA-19279: XPTY0004 - XQuery dynamic type mismatch: expected singleton sequence - got multi-item sequence
Cause: The XQuery sequence passed in had more than one item.
Action: Correct the XQuery expression to return a single item sequence.
ORA-19280
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ORA-19279XPTY0004 - XQuery dynamic type mismatch: expected singleton sequence - got multi-item sequence