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RE: mime types and xml dialects

• To: Nicolas Toper <ntoper@j...>
• Subject: RE: mime types and xml dialects
• From: bry@i...
• Date: Sat, 20 Sep 2003 00:19:32 CET
• Cc: xml-dev@l...

well this is one of the subjects I'm talking 
about, namespaces in a document can in fact 
be pertinent to which mime type it should 
have, so this is something I'm doing, the 
only viable solution it seems to me, until I 
get a chance to look over some of the other 
stuff people have pointed me to, is to add 
application specific headers to the http 
response that tell a requesting application 
what namespaces are in the document, I say 
the only viable solution as it is the only 
thing I can think of that won't break most 
applications that call it, or at least have 
unintended side effects. It is of course 
somewhat process intensive, but our 
application has a module structure so any 
server hosting it could just choose to drop 
the mime reporter module. 

As a side issue, as I have a liking for REST 
as opposed to SOAP, this seems to me to be a 
good component for any application hoping to 
provide a REST-ful interface to this xml 
resources. 
> an idea would be try to comine mime type 
with namespaces (but how? ;=)) if
> you need to know what is the content type 
before opening the file and reads
> the namespaces.
> 
> What do you think of that?
> -----Message d'origine-----
> De : bryan [mailto:bry@i...]
> Envoye : vendredi 19 septembre 2003 13:39
> A : 'Nicolas Toper'; xml-dev@l...
> Objet : RE:  mime types and xml 
dialects
> 
> 
> 
> 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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<http://www.xml.org>, an
> initiative of OASIS <http://www.oasis-
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