demo4Schema.gql

define

age sub attribute,
    value long;

contractDate sub attribute,
    value datetime;

contractRefNum sub attribute,
    value string;

hairColour sub attribute,
    value string;

isMale sub attribute,
    value boolean;

name sub attribute,
    value string;

person sub entity,
    has age,
    has hairColour,
    has isMale,
    has name,
    plays celebrant,
    plays daughter,
    plays father,
    plays mother,
    plays partner1,
    plays partner2,
    plays son,
    plays spouse1,
    plays spouse2;

family sub relation,
    relates daughter,
    relates father,
    relates mother,
    relates son;

marriage sub relation,
    abstract,
    key contractRefNum,
    has contractDate,
    plays marriageToBe,
    relates husband,
    relates wife;

    religousMarriage sub marriage,
        relates spouse1 as wife,
        relates spouse2 as husband;

    secularMarriage sub marriage,
        relates partner1 as wife,
        relates partner2 as husband;

marriageCeremony sub relation,
    relates celebrant,
    relates marriageToBe;