How to change content of xml datatype

From: gajendra s v <svgajendra(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: How to change content of xml datatype
Date: 2013-11-20 17:21:42
Message-ID: CAHjig8--8HpqeqPjm9bg0UAO24avOCProKDxB0L3Y7-dLd9bWw@mail.gmail.com
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Hi All,

I need to change content of xml ,Please any one suggest me how to do,the
xml is below

<Grading_Automated><PassOrFail>Fail</PassOrFail><ActivityScorebased><AutomatedSequence
Value="0"/><Percentage>25</Percentage><Value>34</Value><AutomatedSequence
Value="1"/><Percentage>99</Percentage><Value>432</Value><AutomatedSequence
Value="2"/><Percentage>43</Percentage><Value>232</Value><AutomatedSequence
Value="3"/><Percentage>43</Percentage><Value>323</Value><AutomatedSequence
Value="4"/><Percentage>33</Percentage><Value>432</Value><AutomatedSequence
Value="5"/><Percentage>45</Percentage><Value>3432</Value></ActivityScorebased></Grading_Automated>

I want xml like below,is there any way

'<Grading_Automated><PassOrFail>*Pass*</PassOrFail><ActivityScorebased><AutomatedSequence
Value="0"/><Percentage>*40*</Percentage><Value>34</Value><AutomatedSequence
Value="1"/><Percentage>99</Percentage><Value>432</Value><AutomatedSequence
Value="2"/><Percentage>43</Percentage><Value>232</Value><AutomatedSequence
Value="3"/><Percentage>43</Percentage><Value>323</Value><AutomatedSequence
Value="4"/><Percentage>33</Percentage><Value>432</Value><AutomatedSequence
Value="5"/><Percentage>45</Percentage><Value>3432</Value>
</ActivityScorebased></Grading_Automated>

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