# Source code for openpyxl.workbook.external_reference

    # Copyright (c) 2010-2024 openpyxl

    from openpyxl.descriptors.serialisable import Serialisable
    from openpyxl.descriptors import (
        Sequence
    )
    from openpyxl.descriptors.excel import (
        Relation,
    )

    class ExternalReference(Serialisable):

        tagname = "externalReference"

        id = Relation()

        def __init__(self, id):
            self.id = id