att is a tuple: (name, value)

def parse_att(output, att, indent):
    """
    att is a tuple: (name, value)
    """
    if isinstance(att[1], bs):
        outputStr = '''{indent}<{attribute} {name}="{attname}" {value}="{attvalue}"/>\n'''.format(
            indent=indent,
            attribute=ATTRIBUTE,
            name=NAME,
            attname=sanitize(att[0], spaces=False),
            value=VALUE,
            attvalue=sanitize(att[1])
        )
        if 'We have created a bathymetric digital elevation model' in att[1]:
            foo = io.StringIO()
            foo.write(outputStr)
        output.write(outputStr)
    else:
        att_type = type_map.get(type(att[1]), 'unknown')
        output.write('''{indent}<{attribute} {name}="{attname}" {type}="{att_type}" {value}="{attvalue}"/>\n'''.format(
            indent=indent,
            attribute=ATTRIBUTE,
            name=NAME,
            attname=sanitize(att[0]),
            type=TYPE,
            att_type=att_type,
            value=VALUE,
            attvalue=att[1]
        )
        )