def isValidAssocExtn(extname):
    """
    Determine if the extension name given as input could
    represent a valid association file.

    Parameters
    ----------
    extname : string

    Returns
    -------
    isValid  : boolean value

    """
    validExtnNames = ['asn', 'asc']
    for validName in validExtnNames:
        if extname == validName:
            return True
    return False
