Parsing text from CLOB field that's stored as XML

I have a CLOB field that contains an XML string. That looks like the text below. Is it possible to parse out the text string Denied NOW!!!. I basically want to parse out the data between the first encounter of the <CommentBody> tag.
<CommentHeader>Whatever<CommentDate>2010-01-21-15.16.48.000000
</CommentDate></CommentHeader><CommentBody>Denied NOW!!!</CommentBody>
<CommentHeader>Whatever<CommentDate>2010-01-21-15.10.38.000000
</CommentDate></CommentHeader><CommentBody>Denied YESTERDAY!!!</CommentBody>
Thanks all!!
Edited by: user11938977 on Jun 28, 2010 11:32 AM

Thanks everyone! I'm using Oracle 11.1.0.7.0
It seems to work as long as the Text Contents of CommentBody tag is one word without spaces. If there are spaces in between the tags it errors out. Here's the SQL:
SELECT extractvalue( xmltype('<root>'||t.comments||'</root>'),
'root/CommentBody[1]' ) as "CommentBody"
FROM AP_VCHR_AW t
When COMMENTS contains this data it errors out:
<CommentHeader> <CommentDate>2010-03-04-17.52.53.000000
</CommentDate></CommentHeader><CommentBody>This is an approved vuocher</CommentBody>
<CommentHeader> <CommentDate>2010-03-04-17.52.53.000000
</CommentDate></CommentHeader><CommentBody>This is an approved vuocher</CommentBody>
When COMMENTS contains this data the SQL succeeds:
<CommentHeader>at <CommentDate>2010-01-21-15.16.48.000000
</CommentDate></CommentHeader><CommentBody>Denied!!!</CommentBody>
<CommentHeader> at <CommentDate>2010-01-21-15.10.38.000000
</CommentDate></CommentHeader><CommentBody>Denied!!!</CommentBody>

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