SimpleXML PHP internal/ eternal Tag

hi

i have try pint output xml on PHP files for drupal

here is sample

<msgOther audience="internal">
<title>Additional Developer Information</title>
<lines>

PRODUCT = 283C SE SES Backplane COMPONENT = 283C SES
CUST. MSG ID = CPPEA02 SERVICE ACTION: YES
@REPORTING_LEVEL = CALL_HOME A non-fatal error occurred
on power supply 1. The power supply continues to run,
but should be replaced.

</lines>
</msgOther>
<msgOther audience="internal external">
<title>Failing Item</title>
<ul>
<li>DISKPWR</li>
<li>DISKFAN</li>
<li>FI01106</li>
<li>DEVBPLN</li>
</ul>
</msgOther>
</msgBody>


this is xml

and php which i wrote code


print $xmlobj->msgBody->msgOther_audience="internal"->title ."<br />";
print $xmlobj->msgBody->msgOther_audience="internal external" ."<br />";

seems results came out on PHP which blank

where do i go wrong, any advice would be great