Lurkerpas

Let's consider the following code: ``` RecordWithAnOptionalField ::= SEQUENCE { requiredItem DataUnit, optionalItem1 AlternativeDataUnit OPTIONAL, optionalItem2 AlternativeDataUnit OPTIONAL } DerivedRecord ::= RecordWithAnOptionalField (WITH COMPONENTS {optionalItem1 ABSENT, optionalItem1 PRESENT}) ``` optionalItem1...