Re: Link subjects and targets

To: "Roy T. Fielding" <fielding@avron.ics.uci.edu>, w3c-collab-annotation@w3.org
Subject: Re: Link subjects and targets
From: JCMA@ai.mit.edu (John C. Mallery)
Date: Fri, 27 Oct 1995 00:46:50 -0400
From JCMA@ai.mit.edu Fri Oct 27 00: 46:56 1995

Roy,

You might find the fragment specification of the PDI specification useful.

http://wilson.ai.mit.edu/comlink/pdi.html

It provides default schemes for particular content types which
can be overriden by explicit mention of fragment reference schemes valid for
the content type in question. Since it uses a point based approach, it is possible
to refer to regions with dimensionality greater than two.

Syntax extensibility allows the problem of infinite content types and schemes to
be deferred while the major content types and schemes (text and html) are handled.

With regard to search syntax, I think string search and regex are great, but just like
fixed reference schemes (contrast floating names), these do raise difficulties when
the content provider changes the document without notification to consumers 
serving annotations to it.

John