Title: Message
Very
interesting. Stew on this:
<resource>
<xri>...</xri>
<instance>...(used to be
<data>)</instance>
<attributes> (used to be
<meta>?)
<resource><xri>+DataType</xri>...(isn't this the same as
"class"?)
<resource><xri>+LinkContract</xri>...
<resource><xri>+Association</xri>...
...
</attributes>
</resource>
Something to think about. I think these terms are synonymous,
so it doesn't change much. Especially since you can have multiple nouns
(synonyms) as soon as the data are represented within a
resource.
=Loren
-----Original Message-----
From: Will St Germain IV
[mailto:]
Sent: Wednesday, August 18, 2004 3:34
PM
To: Drummond Reed
Cc: 'Loren West';
Subject: RE: [xdi] Resource and
Data
Drummon,
The more we learn UML as a language to
communicate, it seems reasonable to align to the same nouns when we talk about
moving data from one persistence to another? (note, as an observer I may
be totally out of touch with the topic:)
The nouns that come to mind are:
Instance
Class
Attribute
DataType
Association
Reference:
http://www.omg.org/technology/documents/formal/uml.htm
Thanks,
Will St. Germain
IV
Senior Transition and Information
Architect,
303-924-1547
"Drummond Reed"
<>
08/18/2004 03:59 PM
To
"'Loren West'"
<>, <>
cc
Subject
RE: [xdi] Resource and
Data
Both Loren and Bill have brought up the potential need for a
container
element for subresources (Resources contained by a parent Resource
in the v5
metaschema). Both of them have good arguments for it, and I've
shared with
them at least one good argument against it.
The net net is
that it's a wonderful, meaty topic that we'll be diving into
on today's
call.
=Drummond
-----Original Message-----
From: Loren West
[mailto:]
Sent: Wednesday, August 18, 2004 2:46 PM
To:
Subject: RE: [xdi] Resource and Data
Funny.
I read Gabe's request to mean the difference between <data>
and
it's sibling <resource> elements. Drummond read the request
as
the difference between <data> and it's parent <resource>.
Now
I'm more convinced than ever that we need a different name
for the
<resource> elements that are siblings to <data> (or
at least
group them under a <meta> tag). They often times
get confused
with the parent <resource> element.
=Loren
-----Original
Message-----
From: Drummond Reed [mailto:]
Sent: Wednesday, August 18, 2004 2:34 PM
To: 'Wachob, Gabe';
Subject: [xdi] Resource and Data
Gabe,
it's a fine question. We've been working with the Resource/XRI/Data
element
names for long enough now that no one has bothered to ask this
basic
question.
I will give a very precise definition according to
RFC2396bis and XRI 1.0.
An XDI "resource" is an entity that can be
represented in an XDI document
and identified by an XRI. Period. It's
abstract in the extreme.
XDI "data", by contrast, is any information that
can be represented in an
XDI document that IS NOT identifiable by itself, but
must be placed in the
context of one or more XRIs in order to become
identifiable.
Example:
<data>43</data>
The
value "43" in this XML element is XPath-addressable (in the scope of
a
specific XML document) but not
XRI-addressable.
<resource><xri>=Mary.Jones/(+age)</xri><data>43</data></resource>
Now
this data has become identifiable - in both a local and global context -
with
an XRI and thus now meets the RFC2396bis and XRI 1.0 definition of
a
resource.
Of course, data does not have to be just a literal value.
Complex data can
be a collection of resources. However, a collection of
resources (each of
which itself is identifiable) needs to be put in the
context of one or more
XRIs to be identifiable as a *collection*, so it still
meets the definition
of data.
The next step beyond this simplest
definition is to compare the XDI tuple
with the RDF tuple, and talk about
Resource as Subject, XRI as Predicate,
and Data as Object. That was addressed
in the powerpoint uploaded for the
last TC
call
(http://www.oasis-open.org/committees/download.php/8454/How-XDI-Builds-On-RD
F-v1.ppt).
With your knowledge of RDF, I would love your feedback on that view
of
Resource and Data.
=Drummond
-----Original
Message-----
From: Wachob, Gabe [mailto:]
Sent:
Wednesday, August 18, 2004 11:27 AM
To: ;
Subject: RE: [xdi] Groups -
draft-xdi-metaschema-v5.xsd uploaded
Drummond-
Can you explain in a sentence or two what the
meaning of resource
vs. data is? This doesn't seem to be documented anywhere
- you may have
discussed this on the phone calls, but I don't see explanation
in the
minutes (not that I'd expect such content to be in minutes).
Thanks
-Gabe
__________________________________________________
Chief Systems Architect
Technology Strategies and
Standards
Visa International
Phone: +1.650.432.3696 Fax:
+1.650.554.6817
> -----Original Message-----
> From:
[mailto:]
> Sent:
Tuesday, August 17, 2004 11:39 PM
> To:
>
Subject: [xdi] Groups - draft-xdi-metaschema-v5.xsd uploaded
>
>
> The document draft-xdi-metaschema-v5.xsd has been submitted
> by
Drummond Reed () to the OASIS
> XRI Data
Interchange (XDI) TC document repository.
>
> Document
Description:
> v5 Proposed XDI Metaschema (only change is Comment element
eliminated)
>
> Download Document:
>
http://www.oasis-open.org/apps/org/workgroup/xdi/download.php/
>
8761/draft-xdi-metaschema-v5.xsd
>
> View Document Details:
>
http://www.oasis-open.org/apps/org/workgroup/xdi/document.php?
>
document_id=8761
>
>
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