On Sat, Oct 4, 2008 at 8:46 PM, Pat Hayes <phayes@xxxxxxx> wrote:
>
> On Oct 4, 2008, at 2:46 AM, paola.dimaio@xxxxxxxxx wrote:
>
>> Cool thanks
>>
>> it renders well in firefox without extension
>> but I am not sure understand how one uri can be viewed both as rdf
>> source and html
>
> It is resolved by 'content negotiation', a similar technique used for
> example to decide which language version you get of a multi-language-
> edition newspaper. To regard these editions as a single resource is
> considered good Web practice according to the W3C Architectural
> guidelines, but the extension of this to the HTML/RDF distinction is
> currently more controversial. So this might be good practice,
> depending on how the current debates about RDF and content negotiation
> finally settle out. In the meantime one should probably treat it as
> provisionally good practice, or maybe experimental good practice. (01)
Ahem. (02)
There is not a whiff of content negotiation, which I don't like
because it makes it confusing to figure out what resource the URI
names. I do not consider using content negotiation good practice, even
provisionally. (03)
The specific series of events that happens when the browser does a get
of http://purl.obofoundry.org/obo/OBI_0000225 (04)
purl.obofoundry.org is a cname for purl.org, so purl.org is where a
request is sent. (05)
purl.org has a redirect set so that a request to
http://purl.obofoundry.org/obo/OBI_0000225 results in a directive that
says - look for what you are looking at
http://sw.neurocommons.org/obiterm/OBI_0000225 (a 302 response) (06)
(here's the purl information
http://purl.obofoundry.org/maint/display.pl.cgi?noedit=on&purl=/obo/OBI_0000225&id=nobody) (07)
A get of http://sw.neurocommons.org/obiterm/OBI_0000225 returns a 303
response, which says: I can't give you the resource you want (the
"universal" investigation site) how about this instead, where "this"
is http://ashby.csail.mit.edu/cgi-bin/obiterm?ref=OBI_0000225 (08)
This protocol - using a 303 response to indicate that the entity named
is not the sort of thing you can "get" over the network - is called
httpRange-14 http://www.w3.org/2001/tag/issues.html#httpRange-14 (09)
Note: the relation between what you ask for and what you are given is
currently underspecified. Here one might consider it "provisional good
practice" that one serves RDF/XML that contains statements about the
resource. (010)
A get on that URI retrieves OWL statements about the resource. The OWL
is serialized as RDF/XML. RDF/XML is XML, and so can have a stylesheet
directive that says how it can be transformed to be displayed in a
browser. This is similar in spirit to the model/view distinction in
engineering user interfaces. The model is the RDF, the view is
generated from the model. The stylesheet directive looks like this: (011)
<?xml-stylesheet type="text/xsl"
href="http://ashby.csail.mit.edu/cgi-bin/obiterm.xsl?ref=OBI_0000225";?> (012)
The browser then gets
http://ashby.csail.mit.edu/cgi-bin/obiterm.xsl?ref=OBI_0000225 in
order to get that transform, then applies it to the RDF/XML to
generate HTML that it can display. (013)
For those that might think that this looks like a lot of traffic to
generate the page, I'll remind that there are a variety of ways that
this same information can be retrieved much more efficiently, for
example the whole OBI OWL file
(http://purl.obofoundry.org/obo/obi.owl), or as a query against the
Neurocommons triple store at http://sparql.neurocommons.org/ . For the
single dereference of a citable name, we consider it more important
that we try as best possible to not confuse what the URI denotes, and
to have systems in place that reduce as much as possible the chance
that there be incentive to give another name (URI) for the same
entity. (014)
-Alan (015)
>
> Pat
>
>>
>>
>> or do we have more than one uri for the same resource? if so, is that
>> legal/good practice?
>>
>> thanks
>>
>> PDM
>>
>>
>> On Sat, Oct 4, 2008 at 12:35 AM, Alan Ruttenberg
>> <alanruttenberg@xxxxxxxxx> wrote:
>>> Whoops, typo: That should be: http://purl.obofoundry.org/obo/OBI_0000225
>>> Thanks for noticing!
>>> Note that if you view source, you will see RDF rather than HTML. The
>>> HTML is browser only, generated by a stylesheet instruction.
>>> -Alan
>>>
>>> On Sat, Oct 4, 2008 at 3:19 AM, <paola.dimaio@xxxxxxxxx> wrote:
>>>>> - http://purl.obofoundry.org/obo/OBO_0000225 - an example of what
>>>>> we
>>>>> think should be a typical response for an ontology term
>>>>
>>>> Alan, when click on that url with firefox i get redirected to
>>>> http://www.berkeleybop.org/ontologies/OBO_0000225
>>>>
>>>> and see 'object not found'
>>>> is this the response to be expecting, or suggesting should be
>>>> expected?
>>>>
>>>>
>>>> --PDM
>>>>
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>>
>>
>>
>> --
>> Paola Di Maio
>> School of IT
>> www.mfu.ac.th
>> *********************************************
>>
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