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RE: mime types and xml dialects

• To: "'Nicolas Toper'" <ntoper@j...>,<xml-dev@l...>
• Subject: RE: mime types and xml dialects
• From: "bryan" <bry@i...>
• Date: Fri, 19 Sep 2003 13:38:36 +0200
• Importance: Normal
• In-reply-to: <LLEOKCMGIEPNLPAGHFBKKEOHCCAA.ntoper@j...>

Well if X wants to get instances of a particular xml or rdf dialect, but
X knows that said dialect is most generally represented as
application/xml+rdf then currently X has to get the whole resource, and
then parse the resource to find out if it is indeed the dialect they
want to retrieve. As a general rule the mime type of a dialect is given
at the above level of granularity because web server mime type
assignments take place at a very high level, i.e. extensions, or
locations, or at best, a combination of extensions and locations. 

However if X knows that they can check if the application is of a
specific type, by checking a Header at the beginning of crawling a site,
then X can probe various headers to determine what mime types a resource
can be interpreted as before consuming bandwidth by actually getting the
resource. 

This is a general usage example, and not deeply thought on so it could
very well be a general uselessness example :)  however as I am currently
implementing some specific functionality for an application, pertaining
to setting Mime types and headers to convoluted to go into here (in
short getting a vcard in xml format, and returning it as xml or setting
up a processing chain to get it as text/x-vcard) it struck me that what
I was doing was in some ways related to problems of getting the proper
resource, and in telling a consumer what the resource actually is.  


-----Original Message-----
From: Nicolas Toper [mailto:ntoper@j...] 
Sent: Friday, September 19, 2003 12:35 PM
To: xml-dev@l...
Subject: RE:  mime types and xml dialects

Sorry I don't understand why you're doing this? Could you explain it to
me
please?
;=)

nicolas

-----Message d'origine-----
De : bryan [mailto:bry@i...]
Envoye : vendredi 19 septembre 2003 12:32
A : xml-dev@l...
Objet :  mime types and xml dialects





Hi,

When returning a mime type of a resource, if that resource is a dialect
of xml then the more general type is text/xml but the more specific type
can be application/rdf+xml which in turn can be even more closely
specified as a subset of RDF.

Currently what I'm doing is returning text/xml for generic xml
documents, and application/rdf+xml for all dialects of rdf; what I'm
considering is the possibility of adding http headers that specify that
there is a range of mime types possible for a resource, and their
likelihood of being the best type for a resource.

Anyone done anything with that, pointers to discussions, projects and
similar stuff in the past would be helpful.








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