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revision 1.116 by benja, Sat Feb 8 20:21:55 2003 UTC revision 1.117 by benja, Sat Feb 8 22:08:01 2003 UTC
# Line 178  Section 9 concludes the paper. Line 178  Section 9 concludes the paper.
178    
179  The dangling link problem has received a lot of attention  The dangling link problem has received a lot of attention
180  in hypermedia research [refs]. As examples, we examine the ways  in hypermedia research [refs]. As examples, we examine the ways
181  in which HTTP, Microcosm [ref] and Hyper-G [ref] deal with the problem.  in which HTTP, Microcosm [ref], Hyper-G [ref] and URNs [ref]
182    deal with the problem.
183    
184  In HTTP, servers are able to notify a client that a document  In HTTP, servers are able to notify a client that a document
185  has been moved, and redirect it accordingly [ref spec?]. However,  has been moved, and redirect it accordingly [ref spec?]. However,
# Line 745  blocks of this form. This is one applica Line 746  blocks of this form. This is one applica
746  indexing (Section 5): Keeping an index of all pointer blocks  indexing (Section 5): Keeping an index of all pointer blocks
747  about pointer ``P``, we can quickly find out the current one.  about pointer ``P``, we can quickly find out the current one.
748    
749  UML to be drawn::  .. uml:: storm_pointers
750    
751                                      obsoleted block      class Pointer
752                                        * -----\  
753                                         /      \      class PointerBlock
754      +---------+ 1      * +---------------+    |          assoc multi(*) - multi(1) Pointer
755      | Pointer |----------| Pointer block |----/          assoc multi(*) - multi(1) role(target) Target
756      +---------+          +---------------+ 1          
757                                 * |      ring = assoc PointerBlock multi(1) - multi(*) role(obsoleted) PointerBlock
758                                   |  
759                                   |      class Target
760                                 1 | target  
761                              +---------+      ---
762                              | Target  |  
763                              +---------+      Pointer.c = (0, 0);
764        horizontally(100, foo, Pointer, PointerBlock);
765        vertically(50, bar, foo, Target);
766        ring.p = PointerBlock.e{right} .. PointerBlock.n{down};
767        
768    
769  In addition to the pointer and the target, pointer blocks contain  In addition to the pointer and the target, pointer blocks contain
770  a list of zero or more *obsoleted* pointer blocks. When a new version  a list of zero or more *obsoleted* pointer blocks. When a new version

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