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Richard Fateman The UCB Digital Library Project Team Thanks to T. Phelps, R. Wilensky for slides

Multivalent Documents: Anytime, Anywhere, Any Type, Every Way User-Improvable Digital Document System. Richard Fateman The UCB Digital Library Project Team Thanks to T. Phelps, R. Wilensky for slides. http://elib.cs.berkeley.edu/. Multivalent Documents: Motivation.

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Richard Fateman The UCB Digital Library Project Team Thanks to T. Phelps, R. Wilensky for slides

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  1. Multivalent Documents: Anytime, Anywhere, Any Type, Every Way User-Improvable Digital Document System Richard Fateman The UCB Digital Library Project Team Thanks to T. Phelps, R. Wilensky for slides http://elib.cs.berkeley.edu/

  2. Multivalent Documents: Motivation • Document manipulation is ubiquitous • e-mail, web browsing, word processing, net news, help systems, program editors, … • Most existing systems are • Pre-specified in format/genre/delivery mechanism • not well integrated • not very extensible: • Word, Framemaker: API for given functions • OpenDoc, HTML+Applet: juxtaposition, not integration • Netscape: Open source, hard to integrate and distribute diverse changes • Situation inhibits experimentation with new functionality, modes of interaction

  3. Goal • Anytime - Add content (annotations or core) and functionality on demand • Anywhere - over network, read-only media, mobile devices • Any Type - scanned page images, HTML,... Implement functionality once, works on any type • Every Way - content, functionality, operation • User - End-user dynamically loads easily, hacker gets deep access and easy distribution • Improvable - Seamless integration of improvements for inexpressive (i.e., all current) formats • Digital Document System - Conform to modern practices: multimedia, structure-based, style sheets, XML, WYSIWYG, GUI, networked, incremental algorithms, ...

  4. Multivalent Documents • A highly open, extensible model of documents • Content: Multiple, distributed layers of intimately related information. • Functionality: Implemented via “behaviors”: small, dynamically loadable, reusable, composable program units. • Infrastructure supports composition via well-defined protocols.

  5. Implementation • Implemented MVD infrastructure in Java • Initially an applet, now an application • In alpha, beta ASN… • Several “applications” developed: • Enlivening scanned page images • “Extensible” HTML • Distributed, in situ annotations • Video scripting • Other individual behaviors • Available athttp://www.cs.berkeley.edu/~wilensky/MVD.html

  6. This is saved as http//...arpa-anno.mvd

  7. Behaviors with temporal extent

  8. The MVD Protocol Suite: Reify fundamental document lifecycle Hub doc restore • Protocols execute methods according to their behaviors’ priority. • Some have a second (“after”) phase in which additional methods are executed in “low-to-high” order • Some protocols traverse trees • Hub document is the persistent MVD object. save High High Low Low Runtime build paint format user-events undo High High High High Before Before Before Before clipboard After After After After Low High Low Low Low Before After Low

  9. Behaviors • All user-level functionality implemented as behavior extensions • Behaviors invoked by framework according to protocols (= function signatures) • Some types of behaviors: • Media Adaptor: OCR (Xdoc), HTML, ASCII • Search with visualization • Structural: alt. select-and-paste, Notemarks • Span: hyperlink, highlight, copy editor mark • Lens: OCR, magnify, notes, Pilot notes • Manager: lens coordination, user interface

  10. Layers of Content

  11. Multivalent Protocols: Restore Protocol and Hub Document • External to internal: • Instantiates relevant behaviors • behaviors initialize • some load corresponding layer(s) • Document components stored as hub document • spontaneous hubs; system built from cascading hubs

  12. Hub Example <MULTIVALENT URL="file:/H:/wilensky/mvd122/demo/xdoc/620/OCR-XDOC/00000001.xdc" PAGES="9" ORGANIZATION="" NOTES="" TYPE="Varian" SEARCHNB="ON" ABSTRACT="" AUTHOR="Hal Varian" GENRE="Xdoc" BIB-VERSION="CS-TR-v2.0" TITLE="A Model of Sales" ID="ELIB//620" ENTRY="February 8, 1996" DATE="February 1996"> <Layer NAME="Personal" BEHAVIOR="multivalent.Layer" URL="inline"> <Span BEHAVIOR="HighlightSpan" CREATEDAT="941142025281“ NB="ANNONB" COLOR="YELLOW" LENGTH="16"> <Start BEHAVIOR="multivalent.Location" TREE="0 49/Stiglitz 1/PARA 2/REGION 0/OCR 0/IROOT" CONTEXT="Stiglitz and %281977%29."> </Start> <End BEHAVIOR="multivalent.Location" TREE="7 50/%281977%29. 1/PARA 2/REGION 0/OCR 0/IROOT" CONTEXT="%281977%29. Stiglitz They"> </End> </Span> </Layer> </MULTIVALENT>

  13. Build Protocol and Document Tree • Isolation to union: Iterates over behaviors, constructing tree for document content (and, soon, a separate tree for the user interface) • Runtime data structure: logical/structural tree • All media types/genres expose structure for manipulation by other behaviors • E.g., augmenting scanned with table, biblio • Media adaptor behavior bridges between concrete and abstract through leaves, throughout lifecycle • E.g., scanned page images = parse XDOC + load image + draw image/OCR • Behaviors request UI categories and elements; system groups and instantiates all requests

  14. Document Represented Internally as Graph annotation root table root section1 section2 section3 base root section1 section2 section3 section2’ p1 p2 p3 p4 table line col1 col2 line line w w w w w w Media adaptors text image

  15. Format Protocoland Graphics Context • Logical to physical: Traverse document tree placing elements at geometric locations • Media-specific leaves report dimensions, internal structural nodes position children, i.e., implement layout policies (line breaking, table cells, frames) • Three coordinate systems: screen, absolute document, and for efficiency, parent-child relative • Current display properties in graphics context: font, colors, line spacing, underline, “signals”, ... • Graphic context changed structurally (style sheets), linear range (spans), geometrically (lenses)

  16. Paint Protocol • System to user: Paint representation of content on screen within viewport • Printing = reformat + repaint on different canvas • Incremental for good performance with lenses, editing • In fact, Paint invokes Format of dirty nodes on demand

  17. Events Protocoland Grabs • User to system: User mouse clicks and keypresses passed as events to system • Events distributed to behaviors according to declared interest within tree region • e.g., table sorting • Defaults for usual editing commands (as replaceable behavior) • Grabs - behavior gets future events directly • e.g., hyperlinks

  18. Save Protocoland Robust Locations • Internal to external: Save reconstitutable description to hub (tag+attributes) • Robust Locations • Documents change, but rely on registration of parts, especially for annotations • Redundant descriptions • ID - guaranteed correct when available • Tree Path - robust to insertion, deletion, change in hierarchy • Context - most flexible, but less reliable

  19. Clipboard Protocoland Behavior Interaction • System to other system: Iterate over corresponding media adapters in the selection, each contributing medium-specific representation • Chunky spans - step by largest wholly-contained subtrees in span • Before/After/Short-circuit (available on all protocols) • e.g., alternative select and paste for biblio

  20. Means of Composition • Overall coordination by core framework protocols and behavior adherence • Side-effect on document tree (e.g., table sorting) • Before/After/Short-circuit (e.g., alt s+p) • Global and graphics context attributes (e.g., current page number, view as image/OCR) • Namespaces • of variables with ESIS values. • Manager behaviors (e.g., lens, UI)

  21. Packaged support for • Robust locations references • Spans (across structural boundaries) • Tree manipulations, traversal • Templates for lens • Style sheet-based and fixed-format layout

  22. MVD Third Party Work • Printing, support for other OCR formats, by HP • Palm Pilots notes, PDF, ink (Francis Li) • Temporal-extent behaviors (Wojciech Matusik) • Japanese support by NEC; application to office document management • Chinese character and multilingual lens by UCB Instructional Support staff (Owen McGrath)

  23. Supporting Services • Annotation Server (ByungHoon Kang) • Service allows annotation search and storage on DBMS. • MVD interface via a behavior. • Emailer (ByungHoon Kang)

  24. GIS Viewer • MVD applied to geo-referenced data • GIS data comprise • geo-rectified images (raster data) • vectors (points, lines, polygons, etc.) • geo-positioned data items • Fits naturally into a layers and behaviors framework

  25. GIS Viewer 3.0 • Supported layer types • Raster: geo-rectified GIF, JPEG • Vectors: internal, DLG, ArcInfo Shape files • Grouping format/protocol: tilePix (data pyramid for raster and vector data) • Behaviors are • pan • zoom (with automatic projection transformation) • change projection • display context • display semi-transparently • “spatial hyperlinks” • user authoring for annotation • issue query

  26. GIS Viewer Example http://elib.cs.berkeley.edu/annotations/gis/buildings.html

  27. GIS Viewer Plans • Harden and distribute • About to inter-operate with MS Terraserver for wide-scale coverage of US. • Possible future developments: • support for OGIS/OGDI for interoperation with other formats, services • support for queries as first class objects • implementation by MVD proper

  28. MVD: Related Work • Integration vs Juxtaposition: OpenDoc, OLE, Quill, HTML with Java applets and plug-ins • Composition vs Shared Library: GNU Emacs • Deep Extension vs Scripting: Dynamic HTML, Microsoft Word, FrameMaker • Union vs Confederation: Microcosm, UNIX Guide, Firefly • Fundamental API vs Open Source: Netscape 5, Tk text widget • Cross-format vs Single Format: IDVI

  29. MVD Challenges • The “W3C standards set” continues to grow and become more powerful. • Some (but not all) MVD-only functionality could be done by browsers implementing CSS2, ECMAScript, XLINK, XPOINTER, etc. • probably also requiring limited extensions (applets or plug-ins) • The MVD approach requires providing all this functionality within our framework. • Even providing good layout, robust HTML parsing is a lot of work. • Fortunately, most of the hard part has been done. • We (at least somewhat) ride the wave of Java improvements. • We will ultimately depend on a Linux-like network of developments to have a competitive open-source platform.

  30. MVD Ongoing Developments • Support for more genres • Fixed image formats: PDF, other OCR wordboxes • Niche formats: LaTeX (alpha DVI adaptor exists) • XML+XSL, etc. • Multi-page documents • homogeneous, heterogeneous, internal, tours,…. • Re-do temporal data (video, sound) • Spatial data (3-D graphics, GIS?) • Still a few HTML features to add….

  31. MVD Developments (con’t) • Support for CSSn. • Proto-CSS1 exists • More annotation tools • E.g., “move text” • Work out multi-user annotation discipline • Annotation service issues • security, groups, self-administering documents • Harden, tune user interface, programmers’ guide • See on-line behavior writer’s guide. • Release to community, get feedback, iterate, use in DLIB project. • Hedge with “MVD Lite”? • MVD-like HTML annotation supported using CSS2, scripting

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