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revision 1.69 by tjl, Thu Sep 18 11:04:06 2003 UTC revision 1.70 by tjl, Thu Sep 18 11:22:24 2003 UTC
# Line 212  XXX Line 212  XXX
212    
213  - orthogonal parts of the structure  - orthogonal parts of the structure
214    
215    Next, we shall discuss the two alternatives for the underlying structure:
216    zzStructure and RDF [#zzstructure-rdf]_.
217    
218  Zzstructure (used in ZigZag(TM))  Zzstructure (used in ZigZag(TM))
219  --------------------------------  --------------------------------
220    
221  Ted Nelson's original  Ted Nelson's original
222  hyperstructure and applitude concepts  hyperstructure and applitude concepts
223  were developed for the zzStructure[#zzstructure] structure (`Nelson 1999a`_),  were developed for the zzStructure [#zzstructure]_ structure (`Nelson 1999a`_),
224  supplemented by the  supplemented by the
225  Floating world (`Nelson 1999b`_) ideas.  Floating world (`Nelson 1999b`_) ideas.
226    
# Line 245  as applitudes without special code. Line 248  as applitudes without special code.
248  Resource Description Framework (RDF, used in Fenfire)  Resource Description Framework (RDF, used in Fenfire)
249  -----------------------------------------------------  -----------------------------------------------------
250    
251  - RDF structure  The RDF structure (`Lassila and Swick 1999`_) is, for our purposes,
252    a 3-hypergraph.
253    
254  - Loom structure views, particularly wheel  - Loom structure views, particularly wheel
255    
# Line 678  Notes Line 682  Notes
682     about them, in this case the idea about how to develop     about them, in this case the idea about how to develop
683     one of them.     one of them.
684    
685    ..  [#zzstructure-rdf] RDF and zzStructure are actually closely
686        related: zzStructure is obtained if a RDF graph is constrained
687        by two uniqueness conditions: for all x, y, there can be
688        at most one triple of the form (x, y, *),  and
689        at most one triple of the form (*, x, y).
690    
691  .. [#zzstructure] zzStructure is the "generic term" Nelson  .. [#zzstructure] zzStructure is the "generic term" Nelson
692     recommends for discussing the structure used in ZigZag(TM),     recommends for discussing the structure used in ZigZag(TM),
693     (Nelson's trademark).     (Nelson's trademark).
694    
695    
696    
697  ..  [#libvob-speed] For some changes (panning, zooming), the scene  ..  [#libvob-speed] For some changes (panning, zooming), the scene
698      need not be regenerated but only the coordinate system      need not be regenerated but only the coordinate system
699      parameters adjusted.      parameters adjusted.
# Line 699  Notes Line 711  Notes
711    
712    
713    
 RDF and ZigZag(tm) structure are actually closely  
 related: ZigZag(tm) is obtained if a RDF graph is constrained  
 by two uniqueness conditions: for all x, y, there can be  
 at most one triple of the form (x, y, *),  and  
 at most one triple of the form (*, x, y).  
   

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