Operation Details
Description: Returns the evidence type of a specific verifiable data item based on a verificationRequirementID.
Sterotype: ns
SQL 
SELECT
  VerifiableDataItem.evidenceType
INTO
  :evidenceType 
FROM
VerificationRequirement,
VerifiableDataItem 
WHERE
 VerificationRequirement.verificationRequirementID = :verificationRequirementID
 AND VerifiableDataItem.verifiableDataItemID = VerificationRequirement.verifiableDataItemID