[tm-pubsubj-comment] Definition of PSI Set

[Scott Tsao <skst4xml@yahoo.com>]

While reading the Background and Questions page
(http://www.oasis-open.org/committees/tm-pubsubj/docs/questions.htm),
I encountered the term "PSI Set" which seems to be a
mechanism for grouping a set of published subjects
having something in common.  I wonder if there is a
more clear definition of it, and how that is reflected
in the current pubsubj.dtd structure.

For example, RDDL (Resource Directory Description
Language, http://www.openhealth.org/RDDL/)
charaterizes a resource in terms of its "Nature" and
"Purpose":

- Related resources have a nature, a machine-readable
label provided by the value of the xlink:role
attribute. For example, the nature of an XML Schema
designed for use with a namespace would be given as
xlink:role="http://www.w3.org/2000/10/XMLSchema".

- Related resources may have a purpose, a
machine-readable label provided by the value of the
xlink:arcrole attribute. The purpose is designed to
convey the intended usage of the related resource. For
example, two related resources might have natures that
indicate they are both schemas, but the purposes might
indicate that one is designed to validate the "strict"
version of the language, the other the "forgiving"
form.

So, if one registered a set of natures shown at the
RDDL natures page
(http://www.openhealth.org/RDDL/natures/) or a set of
purposes shown at the RDDL purposes page
(http://www.openhealth.org/RDDL/purposes/), could
another person publish a PSI Set that contains those
registered natures (or purposes) of RDDL resources?

Regards,

Scott

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