Ray Denenberg, Library of Congress wrote:

> So if we change:
>  <attribute name="type"  fixed="simple"/>
> to:
> <attribute name="type" use="optional">
> <simpleType>
> <restriction base="xsd:string">
> <enumeration value="simple"/>
> <restriction>
> <simpleType>
> <attribute>
> Would that help?

That would work if the W3 accepts the latest proposed changes to xlink
(for v1.1).  Currently it would mean you'd allow for use of xlink that
violates the spec (which requires the type attribute).

I'd change it to required, and then update it to optional if the W3
adopts 1.1.