def to_subread_ds_xml(ds):
    x = XMLBuilder('dataset', id=ds.id,
                   datasetTypeId="pacbio.datasets.subread_dataset")

    with x.metadata:
        x.createdAt(ds.createdAt)
        x.version(ds.version)
        x.name(ds.name)
        x.numRecords("1234")
        x.totalLength("12345")

        with x.dataset:
            x.cellId(str(ds.cellId))
            x.numCells(str(ds.numCells))

    return x