[thredds] catalogRef question.

[Nathan Potter]

On Jul 15, 2008, at 1:22 PM, Ethan Davis wrote:

> Hi Nathan,
>
> The HTML view of a catalog isn't defined in the spec. So, the TDS  
> (and underlying servlet framwork) does not assume that a remote  
> THREDDS catalog can be requested in an HTML view with a simple  
> replacement of .xml with .html. Instead it tries to generate the  
> HTML view itself with the service URL you are seeing.

Thanks Ethan. I figured it was something like that. It raises issues  
for my application as I am trying to use the UNIDAT THREDDS code as an  
implementation of THREDDS in Hyrax - which is not the TDS so doesn't  
have the catalogServices servlet. I guess the reason I am making the  
point is that this is another place where the THREDDS core is tightly  
wedded to the TDS.

N


>
>
> Ethan
>
> Nathan Potter wrote:
>> Ethan et al.,
>>
>>
>> This is a question about THREDDS 3.16 and DataRootHandler.
>>
>> I am looking at configuring a THREDDS catalog to reference a  
>> catalog  on another system. I imagined that I could put this:
>>
>>
>> <catalogRef xlink:href="http://motherlode.ucar.edu:8080/thredds/catalog.xml 
>>  " xlink:type="simple" xlink:title="Motherlode, UNIDATA"   
>> name="Motherlode_UNIDATA"/>
>>
>> into my catalog.xml.
>>
>>
>> When I do that and ask the server for the catalog.xml I get this  
>> entry:
>>
>> <catalogRef xlink:href="http://motherlode.ucar.edu:8080/thredds/catalog.xml 
>>  " xlink:title="Motherlode, UNIDATA" name="" />
>>
>> Although it lost the xlink:type attribute (which is expected) and  
>> also  the value of the name attribute (not expected), it should  
>> still work  since the the xlink:href attribute is correct, and  
>> dereferencing that  absolute URL it will get you that catalog.
>>
>> However when I ask for the catalog.html I get this bit:
>>
>> <a href="/opendap/catalogServices?catalog=http://motherlode.ucar.edu:8080/thredds/catalog.xml 
>>  "><tt>Motherlode, UNIDATA/</tt></a></td>
>>
>>
>> Now, in my mind the value href attribute should have been:
>>
>>     http://motherlode.ucar.edu:8080/thredds/catalog.html
>>
>> I think this because this (the catalog.html document) is the   
>> presentation view of the catalog and it should point to the   
>> presentation view of the referenced catalog. Rather, it points to  
>> a  local servlet... Which I am not running :( because I didn't know  
>> about  it or what it might do.
>>
>> Can you explain what's going on?
>>
>>
>>
>> Nathan
>>
>>
>>
>> = = =
>> Nathan Potter                        ndp at opendap.org
>> OPeNDAP, Inc.                        541.752.1852
>>
>>
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>
> -- 
> Ethan R. Davis                                Telephone: (303)  
> 497-8155
> Software Engineer                             Fax:       (303)  
> 497-8690
> UCAR Unidata Program Center                   E-mail:    edavis at ucar.edu
> P.O. Box 3000
> Boulder, CO  80307-3000                       http://www.unidata.ucar.edu/
> ---------------------------------------------------------------------------
>
>

= = =
Nathan Potter                        ndp at opendap.org
OPeNDAP, Inc.                        541.752.1852