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Webvise: Browser and Proxy Support for Open Hypermedia Structuring Mechanisms on the WWW

Webvise: Browser and Proxy Support for Open Hypermedia Structuring Mechanisms on the WWW. Kaj Grønbæk, Lennert Sloth, & Peter Ørbæk InterMedia - Aarhus University of Aarhus {kgronbak,les,poe}@intermedia.au.dk. …or addressing the challenge:. “- if you notice a connection make a link!”

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Webvise: Browser and Proxy Support for Open Hypermedia Structuring Mechanisms on the WWW

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  1. Webvise: Browser and Proxy Support for Open Hypermedia Structuring Mechanisms on the WWW Kaj Grønbæk, Lennert Sloth, & Peter Ørbæk InterMedia - Aarhus University of Aarhus {kgronbak,les,poe}@intermedia.au.dk

  2. …or addressing the challenge: “- if you notice a connection make a link!” (Tim Berners-Lee, this mornings keynote)

  3. Plan • What is open hypermedia? • The Webvise open hypermedia service for the Web • The Webvise client for authoring and browsing • The Webvise proxy service for read-only browsing • (Demo) • Application domains • Work in progress • Status and conclusion

  4. Open hypermedia for the WWW • Users may create their own structures (links, collections, annotations etc.) on the Web • Structures (contexts) are stored in separate databases • Many layers of structure on top of the same Web documents • Users may apply one or more layers at a time Link object I medfør af § 93, stk. 2 i bekendtgørelse nr. 1053 af 18. december 1995 om levnedsmiddelhygiejne og egenkontrol m.v. og § 20, stk. 2 i bekendtgørelse nr. 931 af 6. december 1995 om materialer og genstande bestemt til at komme i berøring med levnedsmidler fastsættes: • Ændringsbekendtgørelse nr. 1053 af 18. juli 1997 om .....

  5. Combining structure and content Combined HTML, etc. WebviseClient or Proxy Content: Arbitrary Web pages Structures: links, notes, guided tours (Contexts of structure for various subject areas) www.xxx.com www.daimi.au.dk

  6. NavLets Open hypermedia basic architecture Applications • Uses standard on-the-wire protocols (TCP/IP and HTTP) • OHP: Open Hypermedia Protocol - standards proposal put forward by OHSWG (http://www.ohswg.org) • Standard on-the-wire operation format: XML Web Browsers Office apps. Office apps. Web server MS IE NS C Web server Webvise OHP Structure Proxy Server HSP Hyperstore JDBC/ ODBC

  7. Datamodel for open hypermedia structures • Extensible model • Open for new structuring mechanisms • Open for new locating methods • Open for collaboration

  8. LocSpecs: Locating segments of data • A locSpec is used to specify a certain location within a node’s content • LocSpecs use several attributes to hold location information: • Reference, Selection, Selection context, Axis specification. • In most cases one of these attributes is sufficient • Example: Text document • Reference: a bookmark ID or a HTML target name • Selection: the text of the span to search for • Selection context: some surrounding text • Axis: a position, such as start position, and stop position • Detecting and repairing inconsistencies

  9. NewLink: request = (MessageHeader, (endpoint)*, linkType, HyperSpace) Ex.: <messageHeader> <uid>les@daimi.aau.dk</uid> <applName>webBrowserViaHyperviseCl</applName> <opCode>0</opCode> </messageHeader> <endpoint> <id>0</id> <name>Announcements</name> <direction>3</direction> <refspec> <contentspec> <version>v1.0</version> <url>http://www.daimi.aau.dk/Realindex.html</url> <attributes> <name>baseUrl</name><value>[url]http://www.daimi.aau.dk/[/url][frameName][/frameName]</value> <name>frameName</name><value>MAINWINDOW</value> <name>docTitle</name><value>DAIMI</value> </attributes> </contentspec> <locSpec> <objectId></objectId> <structure></structure> <computation>Announcements</computation> <context>no graphics. Announcements: </context> </locSpec> </refspec> response = (LinkId, (EndPointId)*) Ex.: FollowLink: request = (MessageHeader, contentSpec, locSpecList, direction) Ex.: <messageHeader> <uid>les@daimi.aau.dk</uid> <applName>webBrowserViaHyperviseCl</applName> <opCode>202</opCode> </messageHeader> <contentspec> <version></version><url>http://www.daimi.aau.dk/Realindex.html</url> <attributes></attributes> </contentspec> <locSpec> <objectId></objectId> <structure></structure> <computation>Announcements</computation> <context></context> </locSpec> <direction>3</direction> response = (ResponseCode, endpointList) Examples of open hypermedia protocol (OHP) operations

  10. DEMO

  11. Webvise user interface

  12. Internet Explorer extension • Entries added to the context menu (right button menu) • COM communication with Webvise

  13. Proxy server link decoration • Readers only interface • Visual indication on top of augmented pages

  14. MS Office integrations • Word and Excel extended with menu and toolbar • Supports seamless integration of local documents and Web documents • COM communication with Webvise

  15. Application domains Works best with stable sources, such as: • Digital libraries • Document repositories on intranets • Law services Specific examples: • Agricultural advisory service • help farmers in understanding environmental directions and laws published on governmental servers. • Digital library usage in student projects • Site-Reviews • Journalist publishing Internet-based news sites

  16. Work in progress: Collaboration Support • Collaboration on documents is coordinated by means of • Locking • Event notification • Versioning • A variety of modes for coupling users • Uncoupled • Loosely coupled • Tightly coupled

  17. Work in progress: Link types Types are used to distinguish among links with different semantic meaning Examples: • Teachers may use link types such as "introductory", "experienced", and "advanced" to distinguish sources based on the knowledge required to read them. • They may discuss the quality of the sources, by introducing link types such as "recommend as primary reading", "recommend as background reading", "useless" etc. • The teachers may use the type mechanisms to generate filtered browsers, queries etc.

  18. Conclusion and Status • Project undertaken in cooperation with TeleDanmark Internet - the biggest Danish Internet service provider • Stable prototypes being used for pilot experiments • Shares infrastructure with other services • Ariadne guided tour system (presented at WWW7) • Mimicry system for linking in time-based media (also at WWW8) • Potentials for standardization of Internet protocols and datamodel for hypermedia based on external structures • Potential integrations with WebDav mechanisms for full blown authoring support Prototype accessible from http://www.cit.dk/coconut

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