def get_collection_fmt_desc(colltype):
    """Return the appropriate description for a collection type.

    E.g. tsv needs to indicate that the items should be tab separated,
    csv comma separated, etc...
    """
    seps = dict(
        csv='Multiple items can be separated with a comma',
        ssv='Multiple items can be separated with a space',
        tsv='Multiple items can be separated with a tab',
        pipes='Multiple items can be separated with a pipe (|)',
        multi='',
    )
    if colltype in seps:
        return seps[colltype]
    return ''