Edit XML node using actionscript?

How would I go about editing an XML node from within
actionscript?
I load the XML from a file, and before I pass it to an
HTTPService I would like to set the field DateTime. The XML file
that I am using can be seen here:
XML Document
When I try doing something like
myXML.fiAPI.fiHeader.Service.DateTime="time here", it creates a new
fiAPI node with all new children. However, I wish to edit the
current DateTime field without creating a new one.
All help is appreciated.

Thanks to both of you.
ctzn99: I tried that as well, after realizing my mistake.
However, it still does not work. I'm certain I have the path right,
but nothing is set (or in other cases, returned). Even when I use
myXML.fiHeader..., It creates a new fiHeader node and the
corresponding nodes underneath it.
ntsiii: That's a very complex example, like you said...
almost overkill for my problem?
Thanks though!

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<?nameStyle 0?>
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<?nameStyle 0?>
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SELECT
p.NameStyle AS "processing-instruction(nameStyle)",
p.BusinessEntityID AS "Person/@ID",
p.ModifiedDate AS "comment()",
pp.PhoneNumber AS "text()",
FirstName AS "Person/Name/First",
MiddleName AS "Person/Name/Middle",
LastName AS "Person/Name/Last",
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FROM Person.Person p
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ON p.BusinessEntityID = e.BusinessEntityID
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FOR XML PATH('ElementName'),ROOT('RootName');
replace ElementName and RootName with whatever name you need to set for element as well as the root element
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Reading an xml file in actionscript using flex3

plzz tell me how to read an xml file in actionscript using flex3.......

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