Yes, I'm trying to write validate catalog.xml files that will work
with THREDDS tools, but will also be a data source for a digital
library system that we're using.
I'm looking at the 1.0 schema but I don't see that restriction:
http://www.unidata.ucar.edu/schemas/thredds/InvCatalog.1.0.xsd
To test, I grabbed a working catalog:
http://motherlode.ucar.edu:8080/thredds/catalog/nexrad/level2/KVWX/20060809/catalog.xml
Then, I added a second variables section, like so:
<catalog
xmlns="http://www.unidata.ucar.edu/namespaces/thredds/InvCatalog/v1.0";
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.xsd";>
....
<variables vocabulary="DIF">
<variable name="Reflectivity" vocabulary_name="EARTH SCIENCE
> Spectral/Engineering > Radar > Radar Reflectivity"
units="db" />
<variable name="Velocity" vocabulary_name="EARTH SCIENCE >
Spectral/Engineering > Radar > Doppler Velocity" units="m/s" />
<variable name="SpectrumWidth" vocabulary_name="EARTH SCIENCE
> Spectral/Engineering > Radar > Doppler Spectrum Width"
units="m/s" />
</variables>
<variables vocabulary="human-readable">
<variable name="foobar" vocabulary_name="blah blah blah"
units="db" />
</variables>
....
</catalog>
and it passed a Xerces validation of it.
-Darren
--
Darren Hardy
Ph.D. Student
Bren School of Environmental Science & Management
University of California, Santa Barbara
address@hidden
www.bren.ucsb.edu/~dhardy
On Aug 9, 2006, at 12:23 PM, Ethan Davis wrote:
Hi Darren,
Darren Hardy wrote:
Ok, so I could use two <variables> elements to provide all these
descriptions, like so:
<variables vocabulary="CF-1.0">
<variable name="SST" vocabulary_name="sea_surface_temperature"
units="degC"/>
<!-- Foobar omitted because it does not have a CF standard_name -->
</variables>
<variables vocabulary="human-readable">
<variable name="SST" vocabulary_name="OI Cloud-free SST, blah
blah blah" units="degC"/>
<variable name="Foobar" vocabulary_name="My foobar variable"
units="m" />
</variables>
It looks like the catalog schema provides for multiple variables
elements, so this would work for me.
Currently, the schema only allows one <variables> element per
dataset. The schema defines it like this
<xsd:element ref="variables"/>
and the default for the minOccurs and maxOccurs attributes is one.
So, I don't think a catalog with a <dataset> element that had two
child <variables> elements would validate.
How are you planning on your catalog being used? Are you trying to
feed this information into another system?
Ethan
--Ethan R. Davis Telephone: (303)
497-8155
Software Engineer Fax: (303) 497-8690
UCAR Unidata Program Center E-mail: address@hidden
P.O. Box 3000
Boulder, CO 80307-3000
http://www.unidata.ucar.edu/
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