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[thredds] redundant (or possibly conflicting) service definitions?



Greetings Ethan et al.,

I have some more thredds:service questions.

The catalog here:

http://motherlode.ucar.edu:8080/thredds/catalog/fmrc/NCEP/GFS/Alaska_191km/catalog.xml
Contains two compound service definitions. The compound services each contain service elements with the same name: 

 <service name="fileServices" serviceType="Compound" base="">
<service name="ncdods" serviceType="OPENDAP" base="/thredds/ dodsC/" /> <service name="HTTPServer" serviceType="HTTPServer" base="/thredds/ fileServer/" /> 
   <service name="wcs" serviceType="WCS" base="/thredds/wcs/" />
   <service name="wms" serviceType="WMS" base="/thredds/wms/" />
<service name="ncss" serviceType="NetcdfSubset" base="/thredds/ ncss/grid/" /> <service name="cdmremote" serviceType="CdmRemote" base="/thredds/ cdmremote/" /> 
 </service>
 <service name="fmrcServices" serviceType="Compound" base="">
<service name="ncdods" serviceType="OPENDAP" base="/thredds/ dodsC/" /> 
   <service name="wcs" serviceType="WCS" base="/thredds/wcs/" />
   <service name="wms" serviceType="WMS" base="/thredds/wms/" />
<service name="ncss" serviceType="NetcdfSubset" base="/thredds/ ncss/grid/" /> <service name="cdmremote" serviceType="CdmRemote" base="/thredds/ cdmremote/" /> 
 </service>


Question:
1) Is it required that the multiply defined services (ncdods, wcs, wms, ncss, cdmremote) be identically defined? As in they must have the same values for serviceType and base?
2) If the answer to question (1) is "No", then how is it resolved is a dataset has an access element that refers to one of the multiply defined services?
3) If the answer to question (1) is yes, then is it fair to think of the collection of defined services as flat? As in not hierarchical? With the compound services referring to their brethren? 



Thanks,


Nathan


= = =
Nathan Potter                        ndp at opendap.org
OPeNDAP, Inc.                        +1.541.231.3317
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