Derived records
See http://www.eda-twiki.org/cgi-bin/view.cgi/P1076/DerivedRecordTypes.
Derive record types. See tagged records in SUAVE
See http://www.eda-twiki.org/cgi-bin/view.cgi/P1076/DerivedRecordTypes.
Derive record types. See tagged records in SUAVE