The parameter element attribute name from the DataHandlerConfig XML
whose value is the data type of the Geolinkage field (defined in GDAS 0.9.1
specification, section 7.1.4.1.10.9).
Using the parameters the client has provided, and values stored
in the DataHandlerConfig document, make a connection to the right data
source, build an SQL Query and use the results to create to write a
Rowset element (described in the GDAS 0.9.1 specification section 7.2.4.3)
to the passed in OutputStream.