First, we were not supplying authority tag indicators when generating the
overlay template. The xml merge function does not currently transfer
indicators, but we need to do this anyway because newer MARC::Field version
balk at fields with no indicators.
Second, PG 9.1+ adds wrapper tags to xml content that is passed to XMLELEMENT
as an array. So, we'll use XMLAGG to get around that.
Signed-off-by: Mike Rylander <mrylander@gmail.com> Signed-off-by: Dan Wells <dbw2@calvin.edu>