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Subject: RE: [xri] Minutes of SPECIAL XRI TELECON 2-3PM PT Tuesday 2009-01-13
Just to clarify ... it is not the XDI statements that I am unsure about. I am not understanding why XRI syntax needs to change to support addressability of $has predicated XDI statements. > -----Original Message----- > From: Drummond Reed [mailto:drummond.reed@cordance.net] > Sent: Tuesday, January 13, 2009 8:49 PM > To: xri@lists.oasis-open.org > Subject: [xri] Minutes of SPECIAL XRI TELECON 2-3PM PT Tuesday 2009-01- > 13 > > Following are the minutes of a special XRI TC telecon held: > > 2-3PM PT (22:00-23:00 UTC) Tuesday 13 January 2009 > > ATTENDING > > John Bradley > Les Chasen > Drummond Reed > > REGRETS > > Bill Barnhill > Markus Sabadello > Paul Trevithick > > > DISCUSSION > > We discussed the following three main drivers for the proposed XRI 3.0 > syntax (http://wiki.oasis-open.org/xri/XriThree/SyntaxAbnf): > > 1) The GCSDelimiter proposal... > > http://wiki.oasis-open.org/xri/XriThree/GcsDelimiter > > ...is required by the XDI addressing rule based on the XDI metagraph > predicate $has as documented in section 5.3 of... > > http://wiki.oasis-open.org/xdi/XdiOne/RdfGraphModel > > We had a long discussion about the $has examples, which included the > suggestion that the +a+b+c+d example needs to be clarified that it is > only > specific combinations of the XDI RDF statements shown that produce the > XRI > +a+b+c+d (Drummond will fix that for the XDI TC). > > Drummond summarized the requirement this way: the XDI RDF graph needs > to be > able to identify a subset of the graph constituting a path through the > directed graph as a single XRI subsegment. $has is the XDI RDF > metagraph > predicate that permits an XDI RDF statement to decribe the directed arc > between two nodes. > > > 2) The XrefDelimiter proposal... > > http://wiki.oasis-open.org/xri/XriThree/XrefDelimiter > > ...is required by the XDI reification addressing rule documented in > section > 4.2 of the same page linked above. This allows any XDI statement -- > which > itself is a directed graph but which must include forward slashes in > the XDI > address to separate the subject, predicate, and object -- to itself be > treated as an addressable node. > > > 3) Further advantages of both these proposals as reflected in the > proposed > XRI 3.0 ABNF (http://wiki.oasis-open.org/xri/XriThree/SyntaxAbnf) > include > the following: > > * It produces a shorter, cleaner, clearer ABNF with fewer > exceptions and irregularities that the XRI 2.0 ABNF (also shown at > http://wiki.oasis-open.org/xri/XriThree/SyntaxAbnf). > > * In this ABNF, all XRI delimiters are now "atomic", i.e., they > each > can be used independently to delimit an XRI subsegment anyplace within > an > XRI segment, rather than the set of irregular limitations and > exceptions in > XRI 2.0 ABNF. > > We have long recognized that there are also some disadvantages -- that > there > is some cost in backwards compatability, which should be minimized due > to > the transition to new XRI resolution service endpoints with > new URIs, and that there are differing opinions on human-readability of > the > proposed 3.0 syntax. > > Following this discussion, Les was still unsure of the XDI > requirements, > however he will defer to the assessment those actively working on XDI. > > NEXT STEPS > > # DRUMMOND to do a final check-in with Nick Nicholas, who was not able > to > attend this call. > # DRUMMOND AND JOHN to begin preparation of the first Working Draft. > # JOHN to start preparing an analysis of XRI 3.0 parsing and any affect > it > might have on XRI 3.0 resolution. > > =Drummond > > > > --------------------------------------------------------------------- > To unsubscribe from this mail list, you must leave the OASIS TC that > generates this mail. Follow this link to all your TCs in OASIS at: > https://www.oasis-open.org/apps/org/workgroup/portal/my_workgroups.php
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