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
Ling TW, Yan LL. NF-NR: a practical normal form for nested relations. J Syst Integr. 4(4):309–40.
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Dobbie, G., Ling, T.W. (2018). Normal Form ORA-SS Schema Diagrams. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_5041
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DOI: https://doi.org/10.1007/978-1-4614-8265-9_5041
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Publisher Name: Springer, New York, NY
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