How do I ’pull’ data from an XML document

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   I'm sure this must be a pretty simple task, but having never worked with XML before, I'm completely stumped.....
I have been given a url by our head office which produces an XML document containing client data (company name, address, tel no, etc). Lets suppose that the url is something along the lines of http://clientdata?clientid=12345 which produces an xml doc along the lines of:   
- <coname>

- <![CDATA[ Some Company Ltd                    ]]>
<>f(clean);

  </coname>

- <coadr1>

- <![CDATA[ 1 High street             ]]>
<>f(clean);

  </coadr1>

- <cocity>

- <![CDATA[ London             ]]>
<>f(clean);

  </cocity>

How do I go about calling the xml doc and what do I have to do to get the data? For example, I may want to response.write the company name (coname).

Any advice/article urls would be much appreciated.