Comparing
Spatial Hypertext
   Collections
 J. NATHAN MATIAS & DAVID WILLIAMS
Introduction
Diff in the Version Management Workflow




                                      Repository



  Comparing S...
Introduction
Diff in the Version Management Workflow




        Version




                 Check Out


                ...
Introduction
Diff in the Version Management Workflow




                            Make Changes
        Version         ...
Introduction
Diff in the Version Management Workflow




                            Make Changes
        Version         ...
Introduction
Diff in the Version Management Workflow




                            Make Changes
        Version         ...
Introduction
Diff in the Version Management Workflow




       Herrick



        Version




  Comparing Spatial Hyperte...
Introduction
Diff in the Version Management Workflow




       Herrick                                                   ...
Introduction
Diff in the Version Management Workflow




       Herrick                                                   ...
Introduction
Diff in the Version Management Workflow




       Herrick                                                   ...
Introduction
Diff in the Version Management Workflow




       Herrick                                                   ...
Introduction
Diff in the Version Management Workflow



                                                     Slimy Things ...
Introduction
Diff in the Version Management Workflow



                                                     Slimy Things ...
WHY DO WE NEED
                A SPECIAL APPROACH
                FOR SPATIAL HYPERTEXT?




Comparing Spatial Hypertext C...
Why Spatial Hypertext is Special
One-Dimensional Diff




                                           GNU DIFF




 Compari...
Why Spatial Hypertext is Special
One-Dimensional Diff




                                           ARAXIS MERGE




 Com...
Why Spatial Hypertext is Special




                              Two Dimensional




 Comparing Spatial Hypertext Collec...
Why Spatial Hypertext is Special




                              Two Dimensional

                              Internal...
Why Spatial Hypertext is Special




                              Two Dimensional

                              Internal...
Why Spatial Hypertext is Special




                              Two Dimensional

                              Internal...
Why Spatial Hypertext is Special




                              Two Dimensional

                              Internal...
Why Spatial Hypertext is Special




                              Two Dimensional

                              Internal...
Why Spatial Hypertext is Special
Problems with Combined Views




                                           VISUAL UNDERS...
FOUR PRINCIPLES FOR COMPARING
                SPATIAL HYPERTEXT COLLECTIONS

                                          MUL...
PRINCIPLE 1: PERMIT USERS TO
                COMPARE MULTIPLE VIEWS




Comparing Spatial Hypertext Collections   Hypertex...
1: Comparing Multi-View Hypertexts

                                      THREE
                                      VIEW...
1: Comparing Multi-View Hypertexts




                                           COLOR, FONT SIZE CHANGES:
              ...
1: Comparing Multi-View Hypertexts




                                           POSITION CHANGES NOT NOTED IN
          ...
PRINCIPLE 1I:
              DISPLAY COLLECTIONS DISTINCTLY




Comparing Spatial Hypertext Collections   Hypertext 2009   ...
Why Spatial Hypertext is Special
One-Dimensional Diff




                                           GNU DIFF




 Compari...
Why Spatial Hypertext is Special
One-Dimensional Diff




                                           ARAXIS MERGE




 Com...
II: Display Collections Distinctly




                                            INITIALLY: VERTICAL LISTS




  Compari...
II: Display Collections Distinctly




                                            INITIALLY: VERTICAL LISTS

            ...
II: Display Collections Distinctly




                                            INITIALLY: VERTICAL LISTS

            ...
II: Display Collections Distinctly
Comparing Position Differences




                                            MOVEMENT...
II: Display Collections Distinctly
Comparing Position Differences




                                            MOVEMENT...
II: Display Collections Distinctly
Comparing Link Differences




                                            IMPLIED STRU...
II: Display Collections Distinctly
& Side by Side




                                            PRESERVES IMPLIED STRUCT...
PRINCIPLE 1II: DISPLAY DEPENDENCIES FOR
              TREE-STRUCTURED SPATIAL HYPERTEXT




Comparing Spatial Hypertext Co...
III: Display dependencies for
Tree-Structured Spatial Hypertext




                                           INITIAL STA...
III: Display dependencies for
Tree-Structured Spatial Hypertext




                                           INITIAL STA...
III: Display dependencies for
Tree-Structured Spatial Hypertext




                                           INITIAL STA...
III: Display dependencies for
Tree-Structured Spatial Hypertext




                                           DEPENDENCIE...
III: Display dependencies for
  Tree-Structured Spatial Hypertext




Blake cannot become the
child of Swedenborg if it
is...
III: Display dependencies for
  Tree-Structured Spatial Hypertext




Blake cannot become the
child of Swedenborg if it
is...
III: Display dependencies for
  Tree-Structured Spatial Hypertext




Blake cannot become the                             ...
III: Display dependencies for
Tree-Structured Spatial Hypertext




                                           DEPENDENCIE...
III: Display dependencies for
Tree-Structured Spatial Hypertext




                          Dependencies are the most
  ...
PRINCIPLE IV: IDENTIFY DIFFERENCE USING
              INDICATORS WHICH CROSS VIEW PANES




Comparing Spatial Hypertext Co...
IV: Identify Difference Using Indicators
Which Cross View Panes




                                            IF ANY VIS...
IV: Identify Difference Using Indicators
Which Cross View Panes




                                            IF ANY VIS...
Overview




 PRINCIPLE I: PERMIT USERS TO COMPARE
              MULTIPLE VIEWS

 PRINCIPLE II: DISPLAY COLLECTIONS DISTIN...
Also In Our Paper




       Web Dav
                                                            CAD




                 ...
Future Research




 MERGING SPATIAL HYPERTEXT




 Comparing Spatial Hypertext Collections   Hypertext 2009   J. Nathan M...
Future Research




 MERGING SPATIAL HYPERTEXT

 TEXT & TRANSCLUSION ON THE SPATIAL MAP




 Comparing Spatial Hypertext C...
Future Research




 MERGING SPATIAL HYPERTEXT

 TEXT & TRANSCLUSION ON THE SPATIAL MAP

 HISTORICAL LINKING




 Comparin...
Future Research




 MERGING SPATIAL HYPERTEXT

 TEXT & TRANSCLUSION ON THE SPATIAL MAP

 HISTORICAL LINKING

 NON-TREE ST...
Future Research




 MERGING SPATIAL HYPERTEXT

 TEXT & TRANSCLUSION ON THE SPATIAL MAP

 HISTORICAL LINKING

 NON-TREE ST...
Appendix & Plugs




 Comparing Spatial Hypertext Collections   Hypertext 2009   J. Nathan Matias & David Williams
Appendix & Plugs




 Comparing Spatial Hypertext Collections   Hypertext 2009   J. Nathan Matias & David Williams
Appendix & Plugs




 Comparing Spatial Hypertext Collections   Hypertext 2009   J. Nathan Matias & David Williams
Appendix & Plugs




 Comparing Spatial Hypertext Collections   Hypertext 2009   J. Nathan Matias & David Williams
Appendix & Plugs




 Comparing Spatial Hypertext Collections   Hypertext 2009   J. Nathan Matias & David Williams
Bibliography
[1] Ahmed R. and Navathe S. B., 1989. Version Control and                [9] Nelson T. Back to the Future, Hy...
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Comparing Spatial Hypertext Collections

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J. Nathan Matias and David Williams propose an approach to comparison of spatial hypertext collections which avoids becoming entangled in complexities of version management and merging.

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Comparing Spatial Hypertext Collections

  1. 1. Comparing Spatial Hypertext Collections J. NATHAN MATIAS & DAVID WILLIAMS
  2. 2. Introduction Diff in the Version Management Workflow Repository Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  3. 3. Introduction Diff in the Version Management Workflow Version Check Out Repository Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  4. 4. Introduction Diff in the Version Management Workflow Make Changes Version Version Check Out Repository Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  5. 5. Introduction Diff in the Version Management Workflow Make Changes Version Version Check Out Check In Repository Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  6. 6. Introduction Diff in the Version Management Workflow Make Changes Version Version Check Out CHECK IN Repository D IFF! Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  7. 7. Introduction Diff in the Version Management Workflow Herrick Version Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  8. 8. Introduction Diff in the Version Management Workflow Herrick Coleridge Email Version Version Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  9. 9. Introduction Diff in the Version Management Workflow Herrick Coleridge Email Version Version Changes Version Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  10. 10. Introduction Diff in the Version Management Workflow Herrick Coleridge Email Version Version Changes Email Version Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  11. 11. Introduction Diff in the Version Management Workflow Herrick Coleridge Email Version Version Changes DI FF! Email Version Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  12. 12. Introduction Diff in the Version Management Workflow Slimy Things Did Gather Ye Crawl Upon The Rosebuds Slimy Sea Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  13. 13. Introduction Diff in the Version Management Workflow Slimy Things Did Gather Ye Crawl Upon The Rosebuds Slimy Sea DI FF! Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  14. 14. WHY DO WE NEED A SPECIAL APPROACH FOR SPATIAL HYPERTEXT? Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  15. 15. Why Spatial Hypertext is Special One-Dimensional Diff GNU DIFF Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  16. 16. Why Spatial Hypertext is Special One-Dimensional Diff ARAXIS MERGE Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  17. 17. Why Spatial Hypertext is Special Two Dimensional Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  18. 18. Why Spatial Hypertext is Special Two Dimensional Internal Links Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  19. 19. Why Spatial Hypertext is Special Two Dimensional Internal Links Color, and other visual features Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  20. 20. Why Spatial Hypertext is Special Two Dimensional Internal Links Color, and other visual features Implicit Structure Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  21. 21. Why Spatial Hypertext is Special Two Dimensional Internal Links Color, and other visual features Implicit Structure Hierarchy of Spaces (sometimes) Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  22. 22. Why Spatial Hypertext is Special Two Dimensional Internal Links Color, and other visual features Implicit Structure Hierarchy of Spaces (sometimes) Mutable Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  23. 23. Why Spatial Hypertext is Special Problems with Combined Views VISUAL UNDERSTANDING ENVIRONMENT Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  24. 24. FOUR PRINCIPLES FOR COMPARING SPATIAL HYPERTEXT COLLECTIONS MULTIPLE VIEWS DISTINCT PANES DISPLAY DEPENDENCIES CROSS-PANE INDICATORS Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  25. 25. PRINCIPLE 1: PERMIT USERS TO COMPARE MULTIPLE VIEWS Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  26. 26. 1: Comparing Multi-View Hypertexts THREE VIEWS OF THE SAME THINGS Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  27. 27. 1: Comparing Multi-View Hypertexts COLOR, FONT SIZE CHANGES: OUTLINE VIEW Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  28. 28. 1: Comparing Multi-View Hypertexts POSITION CHANGES NOT NOTED IN OUTLINE VIEW FONT SIZE CHANGES NOT NOTED IN MAP VIEW Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  29. 29. PRINCIPLE 1I: DISPLAY COLLECTIONS DISTINCTLY Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  30. 30. Why Spatial Hypertext is Special One-Dimensional Diff GNU DIFF Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  31. 31. Why Spatial Hypertext is Special One-Dimensional Diff ARAXIS MERGE Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  32. 32. II: Display Collections Distinctly INITIALLY: VERTICAL LISTS Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  33. 33. II: Display Collections Distinctly INITIALLY: VERTICAL LISTS CHANGED TO: COMPOSITE Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  34. 34. II: Display Collections Distinctly INITIALLY: VERTICAL LISTS CHANGED TO: COMPOSITE OVERLAY RESULTS IN: HORRENDOUS MESS Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  35. 35. II: Display Collections Distinctly Comparing Position Differences MOVEMENT: POSITION CHANGE OF A SINGLE THING IS EASILY UNDERSTOOD WHEN OTHER THINGS DO NOT CHANGE Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  36. 36. II: Display Collections Distinctly Comparing Position Differences MOVEMENT? POSITION CHANGES CAN ONLY BE UNDERSTOOD BY COMPARING BOTH CONTEXTS Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  37. 37. II: Display Collections Distinctly Comparing Link Differences IMPLIED STRUCTURE OF LINKS LINK SEQUENCE BECOMES CONNECTION BETWEEN LISTS WITHOUT CHANGE TO THE LINK Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  38. 38. II: Display Collections Distinctly & Side by Side PRESERVES IMPLIED STRUCTURE REQUIRES DETAILED HISTORY CANNOT ASSIST MERGES Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  39. 39. PRINCIPLE 1II: DISPLAY DEPENDENCIES FOR TREE-STRUCTURED SPATIAL HYPERTEXT Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  40. 40. III: Display dependencies for Tree-Structured Spatial Hypertext INITIAL STATE Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  41. 41. III: Display dependencies for Tree-Structured Spatial Hypertext INITIAL STATE NEW & DELETED? RENAMED? MOVED? Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  42. 42. III: Display dependencies for Tree-Structured Spatial Hypertext INITIAL STATE NEW & DELETED? RENAMED? MOVED? MOVED! Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  43. 43. III: Display dependencies for Tree-Structured Spatial Hypertext DEPENDENCIES Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  44. 44. III: Display dependencies for Tree-Structured Spatial Hypertext Blake cannot become the child of Swedenborg if it is Swedenborg’s parent Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  45. 45. III: Display dependencies for Tree-Structured Spatial Hypertext Blake cannot become the child of Swedenborg if it is Swedenborg’s parent Something else must become the parent of Swedenborg for Blake to become its child. Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  46. 46. III: Display dependencies for Tree-Structured Spatial Hypertext Blake cannot become the The movement of Blake child of Swedenborg if it to Swedenborg is Swedenborg’s parent depends on Tennyson becoming the parent of Something else must Swedenborg become the parent of Swedenborg for Blake to become its child. Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  47. 47. III: Display dependencies for Tree-Structured Spatial Hypertext DEPENDENCIES SHOWN Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  48. 48. III: Display dependencies for Tree-Structured Spatial Hypertext Dependencies are the most complex calculation needed for comparison. That calculation is easy. Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  49. 49. PRINCIPLE IV: IDENTIFY DIFFERENCE USING INDICATORS WHICH CROSS VIEW PANES Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  50. 50. IV: Identify Difference Using Indicators Which Cross View Panes IF ANY VISUAL INDICATOR COULD BE IMPORTANT TO THE SPATIAL HYPERTEXT, HOW DO WE POINT OUT CHANGES? Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  51. 51. IV: Identify Difference Using Indicators Which Cross View Panes IF ANY VISUAL INDICATOR COULD BE IMPORTANT TO THE SPATIAL HYPERTEXT, HOW DO WE POINT OUT CHANGES? INDICATORS CROSS PANE BOUNDARIES Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  52. 52. Overview PRINCIPLE I: PERMIT USERS TO COMPARE MULTIPLE VIEWS PRINCIPLE II: DISPLAY COLLECTIONS DISTINCTLY PRINCIPLE III: DISPLAY DEPENDENCIES FOR TREE-STRUCTURED SPATIAL HYPERTEXT PRINCIPLE IV: IDENTIFY DIFFERENCE USING INDICATORS WHICH CROSS VIEW PANES Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  53. 53. Also In Our Paper Web Dav CAD Visio Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  54. 54. Future Research MERGING SPATIAL HYPERTEXT Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  55. 55. Future Research MERGING SPATIAL HYPERTEXT TEXT & TRANSCLUSION ON THE SPATIAL MAP Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  56. 56. Future Research MERGING SPATIAL HYPERTEXT TEXT & TRANSCLUSION ON THE SPATIAL MAP HISTORICAL LINKING Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  57. 57. Future Research MERGING SPATIAL HYPERTEXT TEXT & TRANSCLUSION ON THE SPATIAL MAP HISTORICAL LINKING NON-TREE STRUCTURES Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  58. 58. Future Research MERGING SPATIAL HYPERTEXT TEXT & TRANSCLUSION ON THE SPATIAL MAP HISTORICAL LINKING NON-TREE STRUCTURES SPATIAL PARSER Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  59. 59. Appendix & Plugs Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  60. 60. Appendix & Plugs Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  61. 61. Appendix & Plugs Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  62. 62. Appendix & Plugs Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  63. 63. Appendix & Plugs Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams
  64. 64. Bibliography [1] Ahmed R. and Navathe S. B., 1989. Version Control and [9] Nelson T. Back to the Future, Hypertext the Way It Used to Be, Management in Computer-Aided Design Databases, Technical Proceedings of the 18th ACM Conference on Hypertext and Report, CIS-TR-89-9, University of Florida, Gainesville FL Hypermedia (Hypertext 2007) (Manchester, UK, 10-12 Sept [2] Alanen M. and Porres I., 2003. Difference and union of models. 2007) In Perdita Stevens, Jon Whittle, and Grady Booch, editors, UML [10] Nguyen T., Thao C., Munson E. 2005. On Product Versioning in 2003 - The Unified Modeling Language, volume 2863 of Lecture Hypertext. Proceedings of the 12th international workshop on Notes in Computer Science, pages 2–17. Springer-Verlag Software configuration management.(Lisbon, Portugal)(113 – [3] Bernstein M. Collage, Composites, Construction. In Proceedings 132) of the 14th ACM Conference on Hypertext and Hypermedia [11] Østerbyte K. 1992. Structural and cognitive problems in (Hypertext 2003) (Nottingham UK Aug 26-30) providing version control for hypertext. In Proceedings of the [4] Brunet G., Chechik M., Easterbrook S., Nejan S., Niu N., European Conference on Hypertext (ECHT ’92) (Milan,Italy, Sabetzadeh M., A Manifesto for Model Merging. 1st International Nov. 30–Dec. 4), D. Lucarella, J. Nanard, M. Nanard, and P. Workshop pn Global Integrated Model Management (ICSE 2006 Paolini, Eds. ACM Press, New York, NY, 33–42 Workshop) (Shanghai, 20-28 May 2006) [12] Shipman F., Workspace History and the Structure of Hypertext [5] Diffutils: GNU. Accessed 04 Feb 2009: Activity. Second Workshop on Spatial Hypertext (College Park, http://www.Gnu.org/software/diffutils/ Maryland, 12 June 2002) [6] Hicks D., Leggett J., Nürnberg J., Schnase J., A Hypermedia [13] siDiff: University of Siegen, Germany: Accessed 18 December Version Control Framework. ACM Transactions on Information 2008. http://pi.informatik.uni-siegen.de Systems, Vol 16, No 2, April 1998, Pages 127-160 [14] Solis C., ShyWiki- A Spatial Hypertext Wiki. The International [7] Kim D., Shipman F. Efficient Branched History Management Symposium on Wikis (WikiSym)(Porto, Portugal, 08-10 Sept 2008) Based on History Segmentation. 2006 Symposium on Interactive [15] Visual Understanding Environment. Tufts University: Accessed Visual Information Collections and Activity (IVICA)(College 04 Feb 2009. http://vue.tufts.edu/ Station, Texas, 20-27 Oct 2007) [16] Webspiration. Inspiration Software, Inc.: Accessed 04 Feb [8] Marshall C.C., Shipman F. M. Searching for the Missing Link: 2009. http://www.mywebspiration.com Discovering Implicit Structure in Spatial Hypertext. Proceedings [17] Whitehead J.. 1998. Collaborative Authoring on the Web: of the Fourth ACM Conference on Hypertext (Hypertext 2003) Introducing WebDAV. ASIS Bulletin (Oct, 1998), Accessed 4 (Nov. 14-18, 1993), pp. 217-230 Feb 2009. http://www.asis.org/Bulletin/Oct-98/webdav.html Comparing Spatial Hypertext Collections Hypertext 2009 J. Nathan Matias & David Williams

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