def to_dd_type(oc_kind):
    """ to_dd_type takes an OC kind int ID and returns a dd string of the span type

    :type oc_kind: int
    :param oc_kind: OC kind id

    :rtype: string
    :returns: A string of the Span type.
    """
    if oc_kind == 2:
        return 'client'
    elif oc_kind == 1:
        return 'server'
    else:
        return 'unspecified'
