Minutes:Joint XRI & XDI TC Telecon Thursday 2007-06-21

Following are the minutes of
the joint unofficial telecon of the XRI and XDI

TCs at:

 

Date:  Thursday, 5 July 2007 USA

Time:  11:30AM - 12:30PM Pacific Time

 

Event Description:

Weekly unofficial joint call of the XRI and XDI Technical Committees.

 

ATTENDING

 

Les Chasen

Drummond Reed

Markus Sabadello 

Gabe Wachob (second half)

 

 

AGENDA

 

1) DISCUSSION OF THE GLOBALID SYNONYM PROPOSAL

 

The XRI Resolution editors have continued analysis and discussion of
this proposal as detailed on the XRI TC wiki at:

 

      http://wiki.oasis-open.org/xri/XriCd02/CanonicalIdVerification

 

We discussed the following
table from the proposed text for XRI Resolution 2.0 Working Draft 11
Editor’s Draft 03.

 

 

******** EXCERPT FROM ED03 SYNONYM SECTION
********

 

XRI resolution includes
support for synonyms—XRIs,
IRIs, or URIs that are not character-for-character equivalent, but which
identify the same target resource (in the same context, or across different
contexts).  Table 23 describes the five types of synonyms may be expressed
in XRDs.

 

  
  
Synonym

  Element

  
  
  
Cardinality

  
  
  
Identifier

  Scope

  
  
  
Authority

  Scope

  
  
  
Follow
  for additional XRDS?

  
 

 

  
  
LocalID

  
  
  
Zero-or-more

  
  
  
Relative

  
  
  
Hierarchical

  
  
  
No

  
 

 

  
  
GlobalID

  
  
  
Zero-or-more

  
  
  
Absolute

  
  
  
Hierarchical

  
  
  
No

  
 

 

  
  
CanonicalID

  
  
  
Zero-or-one

  
  
  
Absolute

  
  
  
Hierarchical or
  polyarchical

  
  
  
No

  
 

 

  
  
Ref

  
  
  
Zero-or-more

  
  
  
Absolute

  
  
  
Polyarchical

  
  
  
Yes

  
 

 

  
  
Backref

  
  
  
Zero-or-more

  
  
  
Absolute

  
  
  
Polyarchical

  
  
  
No

  
 

Table 23: The five XRD synonym
elements.

 

********* END EXCERPT **********

 

The discussion
focused on the following points:

 

* Making CanonicalID
cardinality zero-or-one reduces confusion about multiple CanonicalIDs, but also
means that if the CanonicalID an XRI authority wants to assert for a target
resource changes, the identifier that was previously asserted as a CanonicalID will
no longer appear as a CanonicalID. Drummond calls this “CanonicalID
migration”. It will generally only happen when a target resource first identified
in a local context later becomes identified in a global context. When that
happens, one or more XRI authorities producing XRDs describing the target
resource may want to change the CanonicalID from a value they originally assigned
locally (i.e., a value that is also a valid GlobalID) to a polyarchical CanonicalID.
However in this case, the value that was previously asserted as a CanonicalID for
the target resource could now be asserted as a GlobalID, so it still serves to
absolutely identify the target resource.

 

* Wil and Markus
have both pointed out in email that value of a GlobalID can be deduced from the
value of a LocalID element in all previous XRDs in the chain of resolution. However
Drummond pointed out that a GlobalID still adds information in that it selects
a specific subset of those LocalIDs to produce an absolute GlobalID. In most
cases this will be a subset of the LocalIDs in the resolution chain that are persistent
identifiers, vs. other LocalID values that may be reassignable. 

 

# DRUMMOND to update
http://wiki.oasis-open.org/xri/XriCd02/CanonicalIdVerification with these points.

 

# DRUMMOND to go
over the updated proposal with Gabe (who had to drop off the call).

 

# DRUMMOND to
complete a writeup of this proposal in context so the editors can review it in
the context of ED03.

 

2) SCHEDULE FOR XRI RESOLUTION 2.0 WORKING DRAFT 11 ED03

 

Drummond reported that he will have
dedicated editing time on ED03 next week, so his goal is to have ED03 posted in
time for next week’s telecon.