def _parse_values(value_string):
    """Parse comma-delimited values from a string"""
    values = list()
    for raw in value_string.split(','):
        raw = raw.strip()
        if len(raw) > 1 and raw[0] == '"' and raw[-1] == '"':
            raw = raw[1:-1].strip()
        values.append(raw)
    return values