function isEntity(context, v) {
        if (v == null) return false;
        return (v.entityType !== undefined);
    }
This entity's key is generated by a KeyGenerator and is set by the backend database. 
    Keys for new entities will be temporary until the entities are saved at which point the keys will
    be converted to their 'real' versions.
    @property KeyGenerator {AutoGeneratedKeyType}
    @final
    @static