def check_xml_for_silence(sbf):
    """
    Function to determine if a section marked in an Audacity xml file contains
    silence or sound.
    
    Parameters
    ----------
    sbf : dictionary
        `<simpleblockfile>` tag parsed from Audacity xml file
        
    Returns
    -------
    silence: boolean
        True if silence, False if sound
    """
    if float(sbf['min']) == 0.0 and float(sbf['max']) == 0.0 and float(sbf[
             'rms']) == 0.0:
        return True
    else:
        return False