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Re: adding xlink:type attribute

Hi Benno,
I will go through our catalogs and add the xlink:type attribute. I'll also add it to our catalog generation tools.
In the InvCatalog 0.6 spec xlink:type had a default value of "simple". Looks like that got dropped in 1.0. Does adding this as a default seem like a good idea? Or would requiring it but no default value be preferable?
The Xlink spec has a non-normative DTD but no W3C Schema. How do others deal with including Xlink in their schemas? We just included a small XLink subset into our schema. Other ideas? 

Thanks,

Ethan

Benno Blumenthal wrote:


Hi John,

OK, so my adding xlink:type="simple" does not break anything.  Good.

But



      3.2 Markup Conformance

An XML element conforms to XLink if:

  1.

      it has a |type| attribute from the XLink namespace whose value
      is one of "simple", "extended", "locator", "arc", "resource",
      "title", or "none", and

  2.

      it adheres to the conformance constraints imposed by the chosen
      XLink element type, as prescribed in this specification.
So I am asking, politely I hope, to make xlink:type required, so that we conform to the xlink spec. For starters, could all the thredds files that you generate have that attribute? 

Benno



John Caron wrote:



 we do already allow the "show" and "type" attribute on an Xlink, see:
http://www.unidata.ucar.edu/projects/THREDDS/tech/catalog/InvCatalogSpec.html#XLink 



      XLink Attribute Group

 <xsd:attributeGroup name="XLink">
   <xsd:attribute ref="xlink:href" />
   <xsd:attribute ref="xlink:title" />
   <xsd:attribute ref="xlink:show"/>
   <xsd:attribute ref="xlink:type" />
 </xsd:attributeGroup>
These are attributes from the XLink specification <http://www.w3.org/TR/xlink/> that are used to point to another web resource. The /xlink:href/ attribute is used for the URL of the resource itself. The /xlink:title/ attribute is what should be displayed to the user. These are the only two attributes currently used in the THREDDS software.You can also add the /xlink:type /or/ xlink:show /attributes/. / 








--
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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