Making custom XML file in Liferay

Is it possible to make a custom XML file in Liferay either with PHP, VM or anything else?

I have a default page, with a form and text fields. When i fill out the form and press the "finish" button below, i want it to create a XML file with the details i just filled in the form. After that the XML file should be send to a FTP where it is stored.

I have the XML file as it should be, as a template, but outside Liferay.

Example for the XML content:

<CustomizedFields>
        <CustomizedField>
            <Name>VIP Customer</Name>
            <Type>Boolean</Type>
            <Value>True</Value>
            <UnitOfMeasure>Kg</UnitOfMeasure>
        </CustomizedField>
</CustomizedFields>

How can i do this? Is there a hook'er already make or is it even possible ?