Technology for Superimposed Information

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Technology for SuperimposedInformation

• Lois Delcambre, David Maier
• Shawn Bowers, Mat Weaver
• Database and Object Technology Lab
• Computer Science and Engineering Department
• Oregon Graduate Institute

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What is Superimposed Information?

• data placed over existing information sources
  to
• highlight
• annotate
• elaborate
• select
• collect
• organize
• connect
• reuse information elements
• often to support new applications, beyond the
  original

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The superimposed and base layers with marks
Superimposed Layer
marks
Base Layer
Information Source1
Information Source2
Information Sourcen

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Superimposed Layer Information Manager (SLIM)
ArchitectureContributions

• Mark Management - to create/resolve marks
• SLIM API - for the application developer
• TRIM store - for generic storage of superimposed
  information

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SLIM API as seen by application
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Model-Based Superimposed Information
Model
Superimposed
Schema Data
Layer
Instance Data with Marks
marks
marks
Base
Information
Information
Layer
Source
Source
1
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But the model and schema are optional
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The Metamodel

• Provides a level of abstraction above models
• Describes the structural features of models

Basic Set of Abstractions
Metamodel
Model Constructs and Relationships
Topic Map
XML
Topic Map Defintions
Schema-Level Data
DTD
Topic Map Instances
XML Document
Instance-Level Data
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XML Model, Schema, and Instance
Model constructs and relationships defined using
the metamodel

• Elements, Element Types, Attributes, Attribute
  Types
• Elements contain Attributes
• Elements can be nested

XML Model
(from, to, price) REQUIRED
XML DTD (Schema)
1575 PDX YVR
213.84
...
XML Document (Instances)
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Basic Types of Mappings
Mapped
Model2
Model1
Converted
Inter-Model
Schema1?
Schema1
Converted
Instances1?
Instances1
Model1
Model1
Mapped
Inter-Schema
Schema1
Schema2
Converted
Instances1
Instances1?
Mapped
Model1
Model2
Model-to-Schema
Schema1
Schema2
Converted
Converted
Instances1
Instances2