def extract_class_identifier_list(oLine):
    """
    Returns a class identifiers list.

    Parameters:

       oLine: (line object)

    Returns: (list of strings)
    """
    sLine = oLine.line.replace(';', '')
    sLine = sLine.split(':')[0]
    sLine = sLine.replace(',', ' ').split()
    if sLine[0].lower() in ['constant', 'variable', 'signal', 'file']:
        sLine = sLine[1:]
    return sLine
