This is a property of type String.
The allowed values for this property are:
- +/-
- ---
- --
- -
- 0
- +
- ++
- +++
{ "type": "PROPERTY_CONSTRAINT_SCHEMA", "constraints": { "type_constraint": "_txt", "allowed_values": [ "+/-", "---", "--", "-", "0", "+", "++", "+++" ] } }