ITU languages for ODP - a personal view - I may be wrong!

1
ITU languages for ODP- a personal view - I may
be wrong!

• Rick Reed
• TSE Limited

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ITU-T languages 2003

• URN (GRL,UCM) - draft
• MSC
• ASN.1 (XML)
• SDL
• TTCN
• eODL

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What is Open Distributed Processing?

• A name for systems that have
• Open service interfaces on objects
• Distribution of objects, data and management
• X.90x.. is a Framework Reference Model
• An ODP system can (but need not be) assessed
  against RM-ODP
• Conformance to RM-ODP does not ensure openness

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Viewpoints

• Enterprise, Information, Computation,
  Engineering, Technology
• RM-ODP set not unique or definitive
• Viewpoint needs a language
• Overlaps require consistency
• Traceable concepts semantics
• Development through viewpoints
• Are viewpoints part of ODP?
• If yes, must they be the RM-ODP ones?

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Transparency

• Hiding distribution from the user
• Access - differences in interface
• Failure - difference in mode
• (re)Location/Migration
• Replication - number of server objects
• Transaction - co-ordination of activities
• Should conform to RM-ODP if used
• Language support for Transparency?

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ITU-T languages for ODP

• Are they suitable?
• Are they used?
• If not, why not? What is?
• Do they match RM-ODP viewpoints?
• Attributes
• Remote, Concurrent, Diverse Environments, Mobile,
  Multiple Copies, Asynchronous, Indirect,
  Separate, Relative, Partial Failure, Late Dynamic
  Binding ...

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Methodology

• RM-ODP has been used as a general framework for
  tool supported design methodology. It provides
  object-oriented concepts and principles for
  structuring the system design. The design process
  is not a pure top-down approach, but is an
  iterative usage of each of the stages from an
  abstract level down to the detailed specification
  and implementation. Repetition of steps is needed
  if errors are detected either by validation on
  the design plane or by testing the implementation.