An ASN.1 Profile Anders Ek

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An ASN.1 ProfileAnders Ek

• Motivation / Scenarios
• Profile Basics
• A Draft ASN.1 Profile
• Example
• Summary

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Motivation Usage Scenarios

• Access to ASN.1 module from UML models
• Visualization of ASN.1 Modules
• Design of ASN.1 Modules

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Accessing ASN.1 Modules

• Precond
• ASN.1 module exist
• Application design using UML
• Need to use type definitions
• Actions
• Import the ASN.1 module into UML as a package
• Access the ASN.1 types from the UML code

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Visualization of ASN.1 Module

• Precond
• Complex ASN.1 modules exists
• Need to understand the modules
• Actions
• Import ASN.1 modules into UML
• Use UML graphics (mainly composition hierarchies
  in class diagrams) to explain understand the
  module.

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Design of ASN.1 Modules

• Precond
• No existing ASN.1 module
• Need to produce one
• Like UML graphics!!
• Actions
• Design using UML class diagrams
• Tag with ASN.1 concepts
• Generate the ASN.1 module

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Motivation Summary

• Accessing ASN.1 type defs from UML models
• Visualization of ASN.1 Modules
• Design of ASN.1 Modules

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Profile Definition Basics

• Purpose
• To define how to associate extra information with
  model elements in a UML model.
• Basics
• A profile is a UML package stereotyped by
  ltltprofilegtgt.
• A profile contains stereotypes that define
• tagged values (the attributes of the stereotype)
• what model element to extend (the extends
  relation to a metaclass)
• Often includes a ModelLibary (package with data
  types)
• A profile contains constraints that give static
  semantics
• A profile typically comes with dynamic semantics
  usually
• informally definined
• implemented as tool feature, often a code
  generator

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Simple Profile Example

• ltltprofilegtgt package
• metaclass from appropriate metamodel
• extention definition
• stereotype definition
• tag definitions (stereotype attributes)

ltltprofilegtgt package UseCaseDetails
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ltltstereotypegtgt UseCaseDef
Precondition Charstring ActionSequence
Charstring Alternatives Charstring Postcondition
Charstring
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Using the Profile

• Apply the profile
• activate addin
• load use model profile
• Select Tagged values... for a use case

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Profiles Summary

• Extends UML
• Stereotypes / tagged values
• Model library
• Semantics
• Constraints
• Dynamic semantics

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A (Very) Incomplete ASN.1 Profile
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Profile
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Model Library
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Example Module
ExampleASN1Module BEGIN EMPLOYEES
SEQUENCE OF PERSON PERSON SEQUENCE name
VisibleString, age INTEGER, car CAR,
house HOUSE CAR SEQUENCE licenseNo
INTEGER, manufacturer VisibleString HOUSE
SEQUENCE address VisibleString END
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ExampleModule
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Example Application
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Example Application, cnt
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Summary

• Purpose
• Usage of ASN.1 modules in UML applications
• Visualization / Design
• Profile
• Stereotypes / tagged values etc
• Constraints
• Semantics
• Issues
• Information classes and objects
• Inline type definitions
• Parametrized classes
• Values and value syntax