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Hi Dan: add the attribute inside the ncml, like this: <dataset name="seawifs aggregation" ID="aggExistingTest" urlPath="aggExistingTest/seawifs.nc"> <serviceName>thisDODS</serviceName> <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2"> <attribute name="name" value="value" /> <aggregation dimName="time" type="joinExisting"> <scan location="R:/testdata/tds/netcdf/seawifs/" suffix=".nc" /> </aggregation> </netcdf> </dataset> you can "reinitalize" and "clear cache" (from debug menu if you have remote management workin) to see the change, or just reload the TDS or restart Tomcat. Ticket Details =================== Ticket ID: NCD-931813 Department: Support THREDDS Priority: Normal Status: Open