3. Elaboration Iteration 1

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3. Elaboration Iteration 1

• 10. Domain Modeling Visualizing Concepts

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Objectives

• Identify conceptual classes
• Create an initial domain model

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Domain Models

• Conceptual class an object or idea.
• Domain model a visual representation of the
  domains conceptual classes.
• UML representation class diagrams that show
• Conceptual classes
• Associations between conceptual classes
• Attributes of conceptual classes
• Methods are not shown.
• I think this is a !OO custom.

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Illustration Mandelbrot Set Viewer
View ________________ Region IterationLimit Spatia
lResolution ColorResolution ColorMap Iterate
Viewer ____________ View
Controller ____________ View Viewer Operation
1 modifies 1
1 views 1
N.B. Conceptual classes are in domain. They are
not design artifacts. (The above classes appear
to be design artifacts.)
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Domain Models

• A domain model is a visual dictionary of
  conceptual classes.
• Conceptual classes are not software components.
• The previous diagram suggests otherwise.
• Other possible conceptual classes include
• Region, SpatialResolution, ColorResolution,
  ColorMap, Iterate

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Conceptual Class Identification

• Conceptual class category list
• See textbook.
• Noun phrases
• Data model patterns
• Existing partial domain models
• E.g., Electronic mail framework

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Noun Phrases

• Identify noun phrases in vision use cases.
• These are candidate conceptual classes.
• Here is an example of a marked up vision.

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Example Noun Phrases

• Viewer
• User
• Fractal
• Library
• Image
• Animation
• Sound display
• Compute engine
• Response
• Command
• View
• Type

• Quality
• Response time
• People
• Art
• Exploration
• User
• Dimension
• Resolution
• Iteration limit
• Iteration function
• Color map
• Display mode

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Example Noun Phrases Omit needless noun phrases
from documents

• Viewer
• User
• Fractal
• Library
• Image
• Animation
• Sound display
• Compute engine
• Response
• Command
• View
• Type

• Quality
• Response time
• People - omit
• Art
• Exploration
• Dimension
• Resolution
• Iteration limit
• Iteration function
• Color map
• Display mode

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Example Noun Phrases Select Preliminary
Conceptual Classes

• Viewer
• User
• Fractal
• Library
• Image
• Animation
• Sound display
• Compute engine
• Response
• Command
• View
• Type

• Quality
• Response time
• Art
• Exploration
• Dimension
• Resolution
• Iteration limit
• Iteration function
• Color map
• Display mode

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Selection Heuristics

• Omit needless conceptual classes.
• Use only
• those use-cases
• that part of vision
• in current system.

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Example Noun Phrases Preliminary Conceptual
Classes

• Viewer
• User
• Fractal
• Library
• Image
• Animation
• Sound display
• Compute engine
• Response
• Command
• View
• Type

• Quality
• Response time
• Art
• Exploration
• Dimension
• Resolution
• Iteration limit
• Iteration function
• Color map
• Display mode

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Domain Model Guidelines

• List conceptual classes.
• Use domain names
• Omit irrelevant classes
• Do not add classes that are not in domain
• Draw them in a domain model.
• Add associations
• Only those necessary to current system
• Add attributes
• Only those necessary to current system
• Put each conceptual class in Glossary.

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My View

• A good modeling language supports every level of
  abstraction uniformly.
• From requirements to implementation classes.
• A lower level extends a higher level.
• I.e., it adds information, making it less
  abstract.