Getting started with XML..

Simple question: we have an partner who wish to send into our application data from their system in the form of an XML document.

We are running Oracle 9i R2 and the Oracle http listener and mod_plsql.

Our app is built using the web pl/sql toolkit. We would like the partner to send us the the document by making an http call to a proceudre on our server and I assume 'post'-ing the data so that on our side we might have a procedure defined as

procedure xml_receiver (p_transaction_id in number,

                        p_xml_document      in clob)

Am I OK to this point - is this right?

If so, then the next piece of the puzzle is: what tools do we use to get the data values out of the XML document?

Finally, once we have processed the document, if we want send back an XML document with status information etc then I assume this can be assembled using the various HTP procedures - or is there a less 'homegrown'  method for returning back an XML document?

Not asking for a solution here just a steer to know the overall architecture and toolkit required.

BTW we do not want to get into SOAP and web services - wouldd rather keep things 'simple' for now using the existing infrastructure.

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jeremy