db.define_table('person',
            Field('name', length=100),
            Field('dob', length=10),
            Field('address', 'text', length=255),
            Field('countryname', length=3),
            Field('statename', length=100),
            )

db.define_table('opslist',
            Field('opid', length=10),
            Field('dop', length=10),
            Field('type_operation', length=25),
            )

db.define_table('cardlist',
            Field('opid', db.opslist),
            Field('name', db.person),
            Field('countryname', length=3, required=True),
            Field('statename', length=100, required=True),
            Field('zip', length=5, required=False),
            )

person = db.person.insert(name=..., dob=..., ...)
opslist = db.opslist.insert(opid=..., dop=..., ...)
db.cardlist.insert(opid=opslist, name=person, ...)