subject indicators

Hello,

Currently I am wiriting my master thesis titled "Topic maps". When I read
about subject indicators I feel a little bit confused :). There are
two kinds of subjects: addressable and non-addressable. In case of
these first ones, subject indicators are simply URLs to the resources
which defined these subjects as unambiguously as possible. When I want
to assign an identity to the non-addressable subject I can use URIs (which
contain also PSIs) or I can create my own definition inside or outside
one of the topic maps. Am I right? :)

Regards,
Magdalena Litwin

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