data access request and response

[bulletz]

hi there!
i know basics of xml. and im using it for a month now.
but i want to learn more. my current project wants me to use
xml to access a data system (send a http request), and displaying the response for that request. see below for example:

-----------------------------------------
request structure

http://www.otherdomain.com/domains.jsp?xml=<parent><cdID>12345<cdID></parent>

response structure

<catalog>
<cd>
<title>titlename</title>
<price>$10.00</price>
</cd>
</catalog>

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questions are, where shall i put the request structure? and how to display the response?

everyone is welcome to help me. =)

thank you

sonny