Re: multiple Selectors and Sources

The reason for the prohibition on multiple selectors, states and sources,
is that they are better described using multiple targets.

One way to do things is better than multiple ways of expressing the same
thing, and the semantics are clearer with multiple targets that all have
the same source with different selectors (or different sources with the
same selector).  It's a graph, so there's no unnecessary repetition :)

HTH,

Rob




On Sun, Apr 21, 2013 at 8:22 PM, Bob Morris <morris.bob@gmail.com> wrote:

> I have come to doubt the need in [1]   for the prohibition on multiple
> Selectors and perhaps for the prohibition on multiple Sources.
>
> It is common for us to encounter multiple records in a single data
> set, each requiring a different Selector and  to each of which we must
> apply the same Body assertions.  Similarly, in our environment of
> replicated data sets having different URIs, we would see the same
> Selectors against several Sources.
>
> My present feeling is that the current Multiplicity mechanisms have no
> difficulty handling these cases, possibly even the cases of both
> multiple Selectors and multiple Sources in the same annotation.
>
> At the moment, I do not see what arguments there are for these two
> multiplicity restrictions that are different from the historical ones
> in [2] for Bodies
>
> [1]February 2013 Draft,
> http://www.openannotation.org/spec/core/20130208/index.html
> [2] May 2012 Draft
> http://www.openannotation.org/spec/core/20120509/index.html
>
> Bob Morris
> --
> Robert A. Morris
>
> Emeritus Professor  of Computer Science
> UMASS-Boston
> 100 Morrissey Blvd
> Boston, MA 02125-3390
>
> IT Staff
> Filtered Push Project
> Harvard University Herbaria
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>
> email: morris.bob@gmail.com
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> http://www.cs.umb.edu/~ram
> ===
> The content of this communication is made entirely on my
> own behalf and in no way should be deemed to express
> official positions of The University of Massachusetts at Boston or
> Harvard University.
>
>