Update xml to replace value

Question

I have seen good example on how to use updateXML to update the value as the one below,
but no luck on search on how to replace from one value to another.
Does anyone have example on how to replace value using updateXML?
Thanks,
Luan
insert into XML_CLOB values ( xmltype(
'<student id="211">
<personal idPer="2561">
<firstName>John</firstName>
<middleName>Michael</middleName>
<lastName>Scott</lastName>
<birthday>15-11-1984</birthday>
<address>8600 Beverly Blvd.</address>
<city>Los Angeles, CA.</city>
<country>USA</country>
</personal>
<personal idPer="2561">
<firstName>John</firstName>
<middleName>Michael</middleName>
<lastName>Scott</lastName>
<birthday>15-11-1984</birthday>
<address>8600 Beverly Blvd.</address>
<city>Los Angeles, CA.</city>
<country>USA</country>
</personal>
<personal idPer="2221">
<firstName>John</firstName>
<middleName>Michael</middleName>
<lastName>Scott</lastName>
<birthday>15-11-1984</birthday>
<address>8600 Beverly Blvd.</address>
<city>Los Angeles, CA.</city>
<country>USA</country>
</personal>
</student>'));
prompt 'select object_value from xml_clob';
select object_value from xml_clob;
prompt 'update XML_CLOBset object_value = updateXML( object_value,/student/personal/city/text(),New York City)where existsNode(object_value,/student[@id="211"]) = 1';
update XML_CLOB
set object_value = updateXML
object_value,
'/student/personal/city/text()',
'New York City'
where existsNode(object_value,'/student[@id="211"]') = 1;

Answer 1

Sure, I meant to find/replace. In the real world example,
I have an order with many items, but one item has typo missing a digit.
I wanted to find that item and replace with new correct value in the xml.
Order: 1234
item: 9000292
item: 9020777
item: 9003833
Let's say my third item "9003833" is not correct and I wanted to replace with new item "9003844". Hope that clear!
here is an example that I am working with:
I would like to replace firstName = "Luan" with "The World is Great" in my example below, and I want to replace only when it finds firstName = "Luan".
drop table xml_clob
create table xml_clob of xmltype;
insert into XML_CLOB values ( xmltype(
'<student id="211">
<personal>
<idPer>2561</idPer>
<firstName>John</firstName>
<middleName>Michael</middleName>
<lastName>Scott</lastName>
<birthday>15-11-1984</birthday>
<address>8600 Beverly Blvd.</address>
<city>Los Angeles, CA.</city>
<country>USA</country>
</personal>
<personal>
<idPer>2221</idPer>
<firstName>Luan</firstName>
<middleName>M</middleName>
<lastName>Nguyen</lastName>
<birthday>06-01-1977</birthday>
<address>2100 Pine Street.</address>
<city>Los Angeles, CA.</city>
<country>USA</country>
</personal>
</student>'));
select * from xml_clob
-- This update statement does not correct. It didn't update the firstName value. I created a new "personal" tag and remove the previous "personal". I wanted to find("Luan") and replace("The World is Great").
UPDATE xml_clob
set object_value =
UPDATEXML(object_value,
'/student/personal[firstName="Luan"]/text()','The World is Great')
-- Thanks,
-- Luan