POST'ed data typically does have a key/value pair. To find out what yours is, dump out all of them by using @names = $query->param.
You can have the people submitting this data use "XML" for the key. They just need to URI encode the XML data, which they are supposed to do anyway.
You question would be better phrased as "How do I read POST data that was submitted without a parameter name?" You might want to rephrase it and post it again.
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