Tests if the logical value %val, which is an integer value, is valid.
The validation is based on the class parameter settings used
for the class attribute this data type is associated with.
In this case, MAXVAL and MINVAL.
classmethod XSDToLogical(%val As %String) as %TinyInt [ Language = objectscript ]
Converts the SOAP encoded input decimal value into a %TinyInt value.
Returns "" for error.