docs: public void validate(String path, Schema schema, Object value, List<ValidationResult> results) {
  		String name = path != null ? path : "value";
  		boolean found = false;
  
  		for (Object thisValue : _values) {
  			if (thisValue != null && thisValue.equals(value)) {
  				found = true;
  				break;
  			}
  		}
  
  		if (!found) {
  			results.add(new ValidationResult(path, ValidationResultType.Error, "VALUE_NOT_INCLUDED",
  					name + " must be one of " + _values, _values, value));
  		}
  	}