Summary: Meta-Data Modeling

Read the summary and the most important questions on Meta-data modeling

• 1 Introduction to meta-data modeling

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• 1.1 IRDS meta-modeling framework

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• What does IRDS stand for?

  Information Resources Dictionary System (IRDS).
  IRDS is designed by the International Organization for Standardization (ISO).
  - Standard (ISO/IEC 1990).

• 1.2 UML/MOF

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• What does OMG stand for?

  Object Media Group.

• What does MOF stand for?

  Meta-Object Facility.

• Why is MOF created?

  The MOF was introduced by OMG in UML 2 to create a common approach
  (gemeenschappelijke aanpak) to meta-modeling.

• What are advantages of using MOF-compliant models?

  The advantages are:
  - the MOF-compliant models can be easily compared;
  - the MOF-compliant models can be exchanged in a standardized way (XML Metadata Interchange);
  - the MOF-compliant models can be stored in the same metadata repository (data warehousing).

• 1) How many meta-model hierarchy layers are defined by MOF; 2) and what are they?

  MOF defines a four-layer meta-model hierarchy:
  –Layer M3: Meta-meta model layer (the MOF model)
  –Layer M2: Meta model layer (the UML meta model)
  –Layer M1: Model layer (the UML model)
  –Layer M0: Information layer (the Application)

• ERD example of the meta-model hierarchy

  M3: defines node and link types;
  M2: defines entity types etc. by distinct node and link types;
  M1: defines the conceptual schema of a database in ER notation;
  M0: contains example data conforming the schema

• 1.3 Meta-data modeling

• What is the definition of meta-data modeling?

  A meta-data model exposes (onthult) the concepts and rules of a technique or method.

• What is the usage of a meta-data model?

  - reasoning about the properties of a method or technique;
  - comparison of methods or techniques;
  - development of systems development tools;
  - relationships and integrations of techniques;
  - assembly (samentellen) of situational methods.

• What are techniques for meta-data modeling?

  There are several techniques for meta-data modeling. Some are:
  - Entity-Relationship Diagrams (ERD);
  - UML class diagrams;
  - Object-Property-Role-Relationship (OPRR) diagrams.