Building a Knowledge Base for Plant-Parasitic Nematodes: Description and Specification of Metadata

  • Jim Diederich
  • Renaud Fortuner
  • Jack Milton
Part of the Nato ASI Series book series (NSSA, volume 7)


We are all familiar with data. For example, if Jill Rogers is a particular employee and her hourly wage is $15.00/hr., then this fact (her hourly wage) is a piece of data. However, metadata is data about data. For example, the fact that the wage is expressed in dollars rather than francs is metadata. Metadata is typically the kind of data used by a database designer to design and implement a database (Tsichritzis & Lochovsky, 1982). There are other kinds of metadata, such as a requirement that every employee have an hourly wage greater than the minimum wage, which is data about the wage data of all employees. As an example for nematodes, the position of the vulva for a particular specimen is data. That the feature vulva position is given as a percentage of body length is metadata. So is the fact that the vulva is often visible under a dissecting microscope and that its position is very useful in identifying promorphs and nests (Fortuner, 1989).


Domain Expert Hourly Wage Primary Character Secondary Character Nest Level 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • Jim Diederich
    • 1
  • Renaud Fortuner
    • 2
  • Jack Milton
    • 1
  1. 1.Department of MathematicsUniversity of CaliforniaDavisUSA
  2. 2.California Department of Food and AgricultureSacramentoUSA

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