Property:ObjectClass
From International Robin Hood Bibliography
Text Ballad collection item Ballad item Ballad tradition
A
Ballad collection item +
Ballad collection item +
Ballad collection item +
Ballad collection item +
Ballad collection item +
Ballad collection item +
Ballad collection item +
B
Ballad collection item +
D
Ballad collection item +
G
Ballad collection item +
Ballad collection item +
Ballad collection item +
Ballad collection item +
S
Ballad collection item +
B
Ballad collection item +
W
Ballad collection item +
Ballad collection item +
Ballad collection item +
Ballad collection item +
Ballad collection item +
{ "type": "PROPERTY_CONSTRAINT_SCHEMA", "constraints": { "type_constraint": "_txt", "allowed_values": [ "Ballad item", "Ballad collection item", "Ballad tradition" ] } }