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Encyclopedia of Database Systems pp 1915–1917Cite as

Normal Form ORA-SS Schema Diagrams

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Synonyms

NF-SS; Normalizing ORA-SS diagrams

Definition

Normal forms have been defined for data models, such as the relational data model, the nested relational data model, the object-oriented data model and more recently, the semi-structured data model, to recognize (and remove) certain kinds of redundant data. A normal form that has been defined for semi-structured data, based on the ORA-SS data model, is described.

Key Points

The definition of a normal form for ORA-SS (Object-Relationship-Attribute data model for Semi-structured data) diagrams is based on the definition of a normal form for the nested relational data model as described by Ling and Yan [1], recognizing the similarity between the nesting relationship in the nested relational data model and hierarchies in the semi-structured data model.

The definition for NF ORA-SS (normal form for the ORA-SS data model) can be broken into three main parts. The first part ensures that every object class is normalized. The second part...

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Recommended Reading

  1. Ling T.W. and Yan L.L. NF-NR: a practical normal form for nested relations. J. Syst. Int., 4:309–340.

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Author information

Authors and Affiliations

  1. University of Auckland, New Zealand,  

    Gillian Dobbie

  2. National University of Singapore, Singapore, Singapore

    Tok Wang Ling

Authors
  1. Gillian Dobbie
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  2. Tok Wang Ling
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Editor information

Editors and Affiliations

  1. College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA

    LING LIU (Professor) (Professor)

  2. Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada

    M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)

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© 2009 Springer Science+Business Media, LLC

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Dobbie, G., Ling, T. (2009). Normal Form ORA-SS Schema Diagrams. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_5041

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