Hi Mike:
Yeah, we have it working.  Take a look at:
http://oceanwatch.pfeg.noaa.gov:8081/thredds/catalogServices?catalog=http://oceanwatch.pfeg.noaa.gov:8081/thredds/aggreg/catalog.xml
We have also tested it with matlab.  There are 
360 files I think in each case.  One aggregates 
based on the file name, the other aggregates 
based on time inside the file.  If you have 
questions as to how we did it, contact Jerome 
King at the email above.  I have cc:'ed him.
Regards,
-Roy M.
At 9:52 AM -0800 3/15/06, Godin, Michael wrote:
I am using THREDDS 3.6, and like Bjørge Solli, I 
have been trying out the example aggregation 
code.  When I initialize the catalog, I get no 
errors or warning in the catalog error file 
(with addition of dataType="Grid" to the dataset 
element).
I am then able to select the "WEST-CONUS_4km 
Aggregation" dataset.  However, when I select 
the Access: OPENDAP link, I get the error:
Error { code = 1; message = "No data root for 
dodsC/satellite/3.9/WEST-CONUS_4km"; };
In one of many attempted workarounds, I tried 
putting the ncml into its own file so I could 
access it through an <access> element.  However, 
it appears that the <access> element ignores the 
dataFomat="NcML" attribute and tries to open the 
ncml as a netcdf and throws an error.
If anyone has an example xml that uses netcdf 
aggregation elements please let me know... I 
really need this to work!
BTW, my xml is:
<catalog 
xmlns="http://www.unidata.ucar.edu/namespaces/thredds/InvCatalog/v1.0"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         name="THREDDS-IDD OPeNDAP Data Server"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.unidata.ucar.edu/namespaces/thredds/InvCatalog/v1.0
         http://www.unidata.ucar.edu/schemas/thredds/InvCatalog.1.0.1.xsd"
         version="1.0.1">
 <service name="ncdods" serviceType="OPENDAP" base="/thredds/dodsC/" />
 <dataset name="WEST-CONUS_4km Aggregation" 
ID="SSEC/IDD-Satellite/3.9/WEST-CONUS_4km-Agg" 
urlPath="satellite/3.9/WEST-CONUS_4km" 
dataType="Grid">
  <serviceName>ncdods</serviceName>
  <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2">
   <aggregation dimName="time" type="joinNew">
     <variableAgg name="IR" />
     <scan 
dateFormatMark="WEST-CONUS_4km_3.9_#yyyyMMdd_HHmm" 
location="/data/ldm/pub/native/satellite/3.9/WEST-CONUS_4km/" 
suffix=".gini" />
   </aggregation>
  </netcdf>
 </dataset>
</catalog>
--
**********************
"The contents of this message do not reflect any 
position of the U.S. Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097
e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address)
voice: (831)-648-9029
fax: (831)-648-8440
www: http://www.pfeg.noaa.gov/
"Old age and treachery will overcome youth and skill."