string replacement based on other conditions

hai everybody,I got a problem.This is a example xml
file .



here is the sample xml file:


<Property>
<Label>Dbms Data Type</Label>
<PermanentName>S_LDD_DBMS_DATA_TYPE</PermanentName>
<Value DataType="STRING">NUMBER</Value>      //comment
this has to be changed based on conditions
</Property>
<Property>
<Label>Dbms Data Type Length</Label>
<PermanentName>S_LDD_LEN</PermanentName>
<Value DataType="INTEGER">4</Value>
</Property>
<Property>
<Label>Data Storage Precision</Label>
<PermanentName>S_LDD_PRECISION</PermanentName>
<Value DataType="INTEGER">0</Value>
</Property>

what i want is:
<PermanentName>S_LDD_DBMS_DATA_TYPE</PermanentName>
<Value DataType="STRING">NUMBER</Value>,which is there
in the above xml file to be


<PermanentName>S_LDD_DBMS_DATA_TYPE</PermanentName>
<Value DataType="STRING">SMALL INTEGER<value>
------NUMBER SHOULD BECOME SMALL INTEGER ONLY IF

<Value DataType="INTEGER">4</Value>---- which has got
a value less than 4
<PermanentName>S_LDD_PRECISION</PermanentName>
<Value DataType="INTEGER">0</Value>------ which has
got a precision of 0

<PermanentName>S_LDD_DBMS_DATA_TYPE</PermanentName>
<Value DataType="STRING">INTEGER<value> ------NUMBER
SHOULD BECOME INTEGER ONLY IF

<Value DataType="INTEGER">4</Value>---- which has got
a value between 4 and  15
<PermanentName>S_LDD_PRECISION</PermanentName>
<Value DataType="INTEGER">0</Value>------which has got
a precision of zero

<PermanentName>S_LDD_DBMS_DATA_TYPE</PermanentName>
<Value DataType="STRING">BIGINT<value> ------NUMBER
SHOULD BECOME BIGINT ONLY IF 

<Value DataType="INTEGER">4</Value>---- which has got
a value greater than 15
<PermanentName>S_LDD_PRECISION</PermanentName>
<Value DataType="INTEGER">0</Value>----which has got a
precision of zero


<PermanentName>S_LDD_DBMS_DATA_TYPE</PermanentName>
<Value DataType="STRING">DECIMAL<value> ------NUMBER
SHOULD BECOME DECIMAL ONLY IF

<Value DataType="INTEGER">4</Value>---- which has got
a value greater than 15
<PermanentName>S_LDD_PRECISION</PermanentName>
<Value DataType="INTEGER">0</Value>----which has got a
precision of 1 or 2


CAN ANYBODY HELP ME IN THIS MATTER

THANKS 
GURU









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