544 |
The system we are proposing is a logical extension |
The system we are proposing is a logical extension |
545 |
of several existing concepts and systems. |
of several existing concepts and systems. |
546 |
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The *extensional* structure, |
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as introduced by `DeRose (1989)`_ is an important concept |
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in this context. |
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|
547 |
5.1 Flexible structure - Unifying structured and unstructured information |
5.1 Flexible structure - Unifying structured and unstructured information |
548 |
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549 |
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550 |
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The *extensional* structure, |
551 |
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as introduced by `DeRose (1989)`_ is an important concept |
552 |
|
in this context. The extensional structure |
553 |
|
is, essentially, the external associations to |
554 |
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the document ("I liked it when I read it in march", |
555 |
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"It's a little similar in idea to that one", ...) |
556 |
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as opposed to the internal (intensional) structure |
557 |
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(sequence of sections, links to references section, ...). |
558 |
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|
559 |
The Aquanet system, introduced by `Marshall et al (1991)`_, |
The Aquanet system, introduced by `Marshall et al (1991)`_, |
560 |
unified ideas from the freely structured hypertext systems |
unified ideas from the freely structured hypertext systems |
561 |
and tightly structure knowledge representation. |
and tightly structure knowledge representation, |
562 |
It used a frame-based representation, |
allowing the extensional structure to be explicitly |
563 |
|
represented in the system. |
564 |
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Aquanet uses a frame-based representation, |
565 |
with custom schemas: classes contain slots to be filled by other |
with custom schemas: classes contain slots to be filled by other |
566 |
objects. |
objects. |
567 |
However, the system is still restricted to using separate |
However, the system is still restricted to using separate |