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Good question Katie. I think the authors of the dtd2schema got it  
wrong. I was one of the authors! <ref target="ref01"> is fine, I  
think, as it is an "internal" link. Though I should go back and review  
the W3C XLINK specifications, as we made it possible to treat the  
<ref> either in the "old fashion way," that is @target of type IDREF;  
or using XLink, and I do not recall, at the moment, the rationale.

It is very likely that all of the EAD linking will be reviewed in the  
next revision of EAD.


On Aug 26, 2010, at 2:00 PM, Dunn, Kathryn M. wrote:

> Hello!
>
> I'm new to EAD and am trying to understand the differences between
> documents that validate using the DTD and the XSD schema.
>
> I used dtd2schema.xsl (http://www.loc.gov/ead/dtd2schema.xsl) to
> transform a DTD-valid document into an XSD schema-valid document.  I
> have a question about one of the changes it made.
>
> Before transformation (original DTD-valid EAD):
> <ref target="ref01">This</ref> is an internal link.
>
> After transformation using dtd2schema:
> <ref xlink:type="simple" target="ref01" xlink:href="">This</ref> is an
> internal link.
>
> Why are the xlink:type="simple" and xlink:href="" attributes added?
> Schema validation doesn't fail if I remove them.  Are either of them
> necessary or desirable?  I understand why you'd see these if you had
> linktype and href attributes in your original EAD.
>
> Also, when would you use the href attribute on a ref element instead  
> of
> a target attribute?
>
> Thanks very much for any help in advance!
> Katie
>
> -----
> Katie Dunn
> Technology & Metadata Librarian
> Rensselaer Polytechnic Institute
> 518-276-8353
> [log in to unmask]