1. Sudarshan Murthy 1, David Maier 1, Lois Delcambre 1, Shawn Bowers 2
Superimposed Applications using SPARCE (Superimposed Pluggable Architecture for Contexts and Excerpts)
Sudarshan Murthy 1, David Maier 1, Lois Delcambre 1, Shawn Bowers 2
1 Department of CSE, OGI School of Science & Engineering at OHSU
2 San Diego Supercomputer Center, University of California, San Diego

2. Superimposing Information
Overlaying new information on top of existing information
Add new data
Impose new schema and model
Benefits
No replication of existing information
Preserve context
Make new connections between parts of existing information
Flexible (multiple) organization
Abstractions: Mark, Context
Heterogeneous sources: Word, Excel, PDF, HTML,…
17-Jan-19
Superimposed Applications using SPARCE

3. Superimposed Applications using SPARCE
Marks
A Mark is a reference to a base-layer element
Several mark implementations exist
Addressing scheme usually depends on the base type
PDF mark uses page no. + starting and ending word index; MS Word mark uses starting and ending character index
Marks provide uniform interface across base types and access protocols
17-Jan-19
Superimposed Applications using SPARCE

4. Superimposed Applications using SPARCE
Excerpts and Context
Name
Value
Excerpt
Cheatgrass, Bromus tectorum, grows near many caves in this project area.
HTML
Cheatgrass,  <i>Bromus tectorum </i>,   grows near many caves in this project area.
Section Heading
Noxius Weeds and Exotic Plants
Context is information about a marked region
Context element is one piece of context information
Context definition varies across and within base types
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Superimposed Applications using SPARCE

5. Superimposed Applications using SPARCE
SPARCE Overview
Superimposed Layer
Base Layer
Acrobat
SA 1
SPARCE
XML
Marks
Word
SA 2
<mark ID=“…”>
<type>…</type>
<address>…</address> …
</mark>
Relations
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Superimposed Applications using SPARCE

6. Superimposed Applications using SPARCE
RIDPad
A superimposed application to collect and organize superimposed information
Name
RIDPadDoc ID
Size
Location
Group
Description
Item
Belongs to
0..1 *
Contains
Address
Mark
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Superimposed Applications using SPARCE

7. Superimposed Applications using SPARCE
Groups
Word mark’s context in Context Browser
Items
Word mark activated
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Superimposed Applications using SPARCE

8. Superimposed Applications using SPARCE
Creating a Mark
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Superimposed Applications using SPARCE

9. Superimposed Applications using SPARCE
Creating a Mark
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Superimposed Applications using SPARCE

10. Superimposed Applications using SPARCE
Creating a Mark
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Superimposed Applications using SPARCE

11. Superimposed Applications using SPARCE
Schematics Browser
An application to superimpose ER-style schematics
PDF mark’s excerpt in Context Viewer
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Superimposed Applications using SPARCE

12. Superimposed Applications using SPARCE
Summary
SPARCE allows superimposing of different conceptual models over base information
Heterogeneous base types
No interference with base information
Sub-document granularity
It allows development of new superimposed applications, and to support new base-layer types and contexts with minimal effort
17-Jan-19
Superimposed Applications using SPARCE