class Individual:
    def __init__(self, id, index, identifiers, metadata):
        self.data_type = "individual"
        self.id = id
        self.index = index
        self.identifiers = identifiers
        self.metadata = metadata
        self.instances = 0


class Role:
    def __init__(self, id, index, identifiers, metadata):
        self.data_type = "role"
        self.id = id
        self.index = index
        self.identifiers = identifiers
        self.metadata = metadata
        self.instances = 0
