021019-1: |
Give an ASN.1 specification of a protocol unit for transferring a list of people, and for each person indicating which other person is his/her father and mother. Fathers and mothers outside the listed people need not be specified. The solution must be able to handle two different people with the same name. |
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Answer |
One possible solution:Personlist ::= SEQUENCE OF Person Person ::= SEQUENCE { Id ::= NumericString (SIZE (10)) -- Social security no without space and dash Many students gave variants of the following solution Personlist ::= SEQUENCE OF Person Person ::= SEQUENCE { Id ::= NumericString (SIZE (10)) -- Social security no without space and dash I gave five points to this solution, since it requires a lot of repetition of information. For example if we have John father of Mary and Eliza then the name of John has to be repeated twice. Since the socialsecuritynumber is a unique identification of a person, it is enough to indicate the parent with this number. |