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Subject: Agenda - XDI TC Call Wed. 7 December 9PM-10AM Pacific
XDI TC Members and Observers: I apologize for the mix-up on last week's
call; I called in before others and when no one else was there, went to another
task. Take two tomorrow: we will discuss the same topic, this time with some
additional detail from the draft i-tag spec (copied at the end of this
message). Following is the date/time, call-in info, and agenda for the next
unofficial XDI TC telecon. Date: Wednesday, 7 December 2005 Time: 09:00AM - Dial-in number: Access Code: 2647893 AGENDA 1) DISCUSS XDI TRIPLE TRIPLE MODEL This is a new proposal, inspired both by work on the "i-tag"
initiative (see http://www.seedwiki.com/wiki/itag/itag.cfm and in particular http://www.seedwiki.com/wiki/itag/power_i-tags.cfm?wpid=220488) as well
as work on simple link contracts (as requested by Victor). The proposal is that the XDI graph can be optimized not by just
limiting it to 3 levels deep, but also 3 levels "across". This means that
everything in the graph can be represented by an RDF "triple triple" -- a
maximum of 3 linked RDF triples - a Subject triple, a Predicate triple, and an
Object triple. We'll discuss as best we can in the absence of a shared whiteboard
(which we may want to arrange for future meetings). Following is an HTML excerpt from the
draft i-tag spec that explains this model in greater detail: I-tag syntax is based on the RDF "subject-predicate-object"
statement model.XRIs are used to serializing these RDF statements because: XRIs
support the use of global identifiers within other global identifiers (i.e.,
XRIs within XRIs, or URIs/IRIs within XRIs) in order to express structured, cross-context
relationships. XRI
syntax enables the persistent identification of the resources (people,
organizations, dictionaries, media objects) participating in an i-tagging
relationship. As applied to tagging, the RDF + XRI model maps as follows:
This RDF model is then applied recursively one layer deep, so each of
the three XRIs above can also be expressed using its own RDF triple. This
yields the following matrix:
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