ActionWebService and Key/Value Pairs

I'm trying to import data from an existing database that
relies on 
key/value pairs. I'd like to set up an ActionWebService
server for this 
data and have that system send a message to me when it
receives 
something new, but I'm unsure of a way to handle the
parameter 
specifiers on my end.

Each request will contain a variable-length list of
key/value pairs, but 
ActionWebService seems as though it expects a structured
list of 
parameters. As such, I'd have to explicitly expect a list
of about 800 
parameters from my client, and not only is that ridiculous,
but not all 
the objects in the database have values for all the keys, so
it'd just 
end up being empty sets being sent over the wire; hardly
efficient.

Am I going about this wrong or is this a limitation of AWS?

Thanks,
Adam

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