HTTPService: How can I send a variable or call a function in it?

Ok i have the following HTTPService request:
<mx:HTTPService id="userRequest" url="
http://mywebsite/get_data.php"
useProxy="false" method="POST">
<mx:request xmlns="">
<user1>{username.text}</user1>
</mx:request>
</mx:HTTPService>
Pretty straight forward stuff there. EXCEPT... i want to use
a variable instead of 'username.text...
<user1>{UserNameList[0]}</user1>
OR i want to be able to call a function that will return the
results such as:
<user2>{ UserFunction() }</user2>
Of course, neither of these work and this makes me sad :(
Anyone have any ideas? Much appreciated~!

on that i can't help
i'm a .net programmer an i use a lot httpservices but mostly
i use webservices to get my data.
But i can give my way of working. When you send your data
from flex you are sending a virtual xml file thru http, then in
.net using it xml class i read this stream of xml coming from flex,
go to my database, get the result , wrapped it in xml and send thru
stream again, so that flex understands the answer. When it gets to
flex i just use e4x to read my data.
There are tons of tutorials on the net for PHP, i wish i had
half for .Net :D

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HAI,
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Write some code in the program to come to 2nd list from 5th list
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Field Symbols
Field symbols are placeholders or symbolic names for other fields. They do not physically reserve space for a field, but point to its contents. A field symbol cam point to any data object. The data object to which a field symbol points is assigned to it after it has been declared in the program.
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Assignments to field symbols may extend beyond field boundaries. This allows you to address regular sequences of fields in memory efficiently.
You can also force a field symbol to take different technical attributes from those of the field assigned to it.
The flexibility of field symbols provides elegant solutions to certain problems. On the other hand, it does mean that errors can easily occur. Since fields are not assigned to field symbols until runtime, the effectiveness of syntax and security checks is very limited for operations involving field symbols. This can lead to runtime errors or incorrect data assignments.
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check the below links u will get the answers for your questions
http://help.sap.com/saphelp_nw04/helpdata/en/fc/eb3860358411d1829f0000e829fbfe/content.htm
http://www.sts.tu-harburg.de/teaching/sap_r3/ABAP4/field_sy.htm
http://searchsap.techtarget.com/tip/1,289483,sid21_gci920484,00.html
Syntax Diagram
FIELD-SYMBOLS
Basic form
FIELD-SYMBOLS <fs>.
Extras:
1. ... TYPE type
2. ... TYPE REF TO cif
3. ... TYPE REF TO DATA
4. ... TYPE LINE OF type
5. ... LIKE s
6. ... LIKE LINE OF s
7. ... TYPE tabkind
8. ... STRUCTURE s DEFAULT wa
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Effect
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FIELD-SYMBOLS <PT> TYPE ANY.
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Addition 1
... TYPE type
Addition 2
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Addition 3
... TYPE REF TO DATA
Addition 4
... TYPE LINE OF type
Addition 5
... LIKE s
Addition 6
... LIKE LINE OF s
Addition 7
... TYPE tabkind
Effect
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ASSIGN, DATA
Additional help
Declaring Field Symbols
Reward points if useful
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