[uf-discuss] Semantic context (Was: OpenID)

Scott Reynen scott at randomchaos.com
Wed Feb 21 09:12:41 PST 2007

On Feb 21, 2007, at 10:34 AM, Arve Bersvendsen wrote:

>> The UID seems to be limited to the hcard itself, while the rel's  
>> context is larger; is there a way to tell what context is meant?
> No, but then again, the context of a random class attribute is not  
> necessarily limited to the hcard itself.  It is up to whoever  
> defines the hCard microformat to say what a given attribute means  
> in any given context.

Not exactly.  We can add new context to HTML-defined contexts, but we  
can't actually change the HTML-defined context.

HTML defines REL:


> This attribute describes the relationship from the current document  
> to the anchor specified by the href attribute

Nothing a microformat spec says will prevent rel from applying to the  
entire document.  We can add more local meaning *in addition to* that  
document-wide meaning, but we can't change what the HTML spec says,  
which is that rel applies to the whole document.  If something can't  
apply to the whole document, it doesn't belong in REL.

HTML defines CLASS:


> This attribute assigns a class name or set of class names to an  
> element.

Class is always local to a single element.  We can add broader  
meaning *in addition to* that local meaning.  This is somewhat the  
opposite of REL.


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