Proposal: Enable keyref for <object> and <param>

The <object> and <param> elements may make references to resources, <object>
via the @data attribute, <param> via the @value attribute when @valuetype is
"ref".

In both cases the value is a URI.

It needs to be possible to use keys in place of these URI references.

For <object>, propose adding new attribute @datakeyref. When specified and
the key is resolvable, the key-provided URI is used, with @data, if
specified, used as a fallback.

For param, propose adding new attribute @keyref. When @keyref is specified,
it implies a value of "ref" for @valuetype if @valuetype is not specified.
If @valuetype is specified with a value other than "ref", @keyref is
ignored. 

When the effective value of @valuetype is "ref" and @keyref is specified,
the @value attribute value, if specified, is used as the fallback URI when
the key reference cannot be resolved.

Cheers,

Eliot


-- 
Eliot Kimber
Senior Solutions Architect
"Bringing Strategy, Content, and Technology Together"
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