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F2F Decision: Sub-classing

From: Robert Sanderson <azaroth42@gmail.com>
Date: Mon, 1 Oct 2012 10:48:51 -0600
Message-ID: <CABevsUFDBMqNbmuwEgGcHESr7C+AYXe98GTyqYL9EYGXF0FhiQ@mail.gmail.com>
To: public-openannotation <public-openannotation@w3.org>
The current document says that subclasses of oa:Annotation express the
"reasons why the annotation was created".  It was expressed that this
is not actually possible, as we are introducing additional semantics
to the meaning of rdf:type.

The consensus was as follows:

- Every annotation MUST have an explicit class of oa:Annotation,
regardless of any other classes
This is in order to make sure that the annotations are recognized as
oa:Annotations to ensure interoperability.

- SubClasses of oa:Annotation should be introduced primarily to
further restrict the data model, and may be introduced by any one.
For example a xxx:Highlight subClass might restrict the model that
there should be exactly one target and no body.

- Existing subclasses will be mapped to a new type of resource, an
oa:Motivation, and referenced by a new predicate from the Annotation:
For example, instead of an oax:Hightlight, one would have:

_:x a oa:Annotation ;
  oa:motivatedBy oax:Highlighting ;
  oa:hasBody <body1> ;
  oa:hasTarget <target1> .

(Mapping to be provided)

- We will not introduce oa:Expectation (the producers expectation of
what a consumer of the annotation will do), as all of the examples
were specific to individual network transactions.
Two examples were discussed:
* A change request, where the expectation is that the consumer will
act upon it.  This is only a valid expectation for transactions
between a client and an agent capable of performing the change.  As
such it does not belong in an interoperability specification, but can
be added in by systems capable of accepting/creating the change.
* The expectation that the server will generate an alert based on the
social network of the annotator.  This is only desirable for the
initial creation of the annotation, not any subsequent harvesting and
reuse.  So this also is only a valid expectation of the initial
transaction between a client and server, rather than a persistent
property of the annotation.


Rob & Paolo
Received on Monday, 1 October 2012 16:49:20 UTC

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