Re: [unrev-II] Fwd: Fw: Re: [PORT-L] Goguen's Semiotic Morph isms

From: Jack Park (
Date: Mon Apr 02 2001 - 08:09:22 PDT

  • Next message: Eric Armstrong: "[unrev-II] Email based on invitation & introduction"


    Modal logic (couldBe, willBe, etc), conceptual drift, a lot of the things
    you mention here are indeed important to the work of an OHS-like
    system. These notions bring to mind the need for what is called
    non-monotonic reasoning capability (the ability to backtrack when some fact
    changes), and version control -- keeping pointers aligned to appropriate
    versions, updating pointers, and so forth. All topics for research,
    discussion, and experimentation.


    At 05:13 AM 4/1/2001 -0500, you wrote:
    >... A quick thought after reviewing the introduction (wish I had time to
    >read the full text of all the great articles and papers out there, there's
    >just so much info and so little time... sigh)
    >Many of the approaches to building ontologies seem to be fixated on a
    >'present-tense' description of the nature of things. For instance, his
    >graph showing the associationg 'cow gives meat' is not really an accurate
    >association, in the sense that no cow (at least none that I know)
    >willingly 'give' meat, but the process involves an actual _change_ in the
    >nature of the cow. It may be more accurate to say that 'cow + slaughter =
    >meat' which is an entirely different relationship, in which the action
    >changes the graph entirely by (possibly) reclassifying the cow under the
    >relation of 'is-a animal' to 'is food'.
    >The issue here obviously is not the slaughter of cows, but how do we
    >express the principles by which an entity changes as it is manipulated
    >over time? Take for example the association, 'house is red'. But if the
    >house is painted, this causes a change in the attribute of the house's
    >color form red to, say, green.
    >If we have the concept of building knowledge bases with an "SDS-like"
    >system as a front end for entering new knowledge, the change of the
    >knowledge content over time is an integral part of the system... How do we
    >record the relations of cause and effect between actions which have been
    >taken over time and the changes in attributes and classifications of the
    >entites within the system? It seems this might be integrally bound up
    >with some sort of versioning or history within the topic-mapping of the
    >It seems there is a lot of interest in topic maps and RDF type
    >descriptions for present tense description of the nature of things, but do
    >these mechanisms adequately address the integration of history, preserving
    >the cause-and-effect which changes the nature of the reality these things
    >Just wondering what folks out there are thinking -- (btw, thanks to
    >everybody on this list for all the fantastic food for thought over the few
    >months i've been lurking)

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