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Annex 1  
4.7 Interface DNAV-PCODE  

  • 1 Characterization of the Interface
  • 2 Example
  • 3 Tool Support
  • 4 Literature
  • 1 Characterization of the Interface

    The interface corresponds to the type "balancing against the results of another basic method".

    DNAV is used to analyze the order, frequency, and mode (reading, writing, updating) of the data accesses to the E/R model in the applications. The results are utilized to generate logical schema specifications. The most frequent access sequences in the application are usually realized by means of programs (modules). Mode and order of the data accesses within the logic operation represented with the help of PCODE - Pseudocode must correspond to the results of the DNAV - Data Navigation Modeling method. The following example illustrates the facts.

    2 Example

    Figure 4.9
    Figure 4.9: Example Interface DNAV-PCODE

    Explanation of the example:

    Order and mode of the data accesses in the DNAV diagram correspond to the order and mode of the data accesses in the Pseudocode documentation. In case the data accesses extend over several modules the following of this order over the modules has to be guaranteed via software.

    3 Tool Support

    - not applicable -

    4 Literature

    /Martin, 1990b/ Chapter 14, Data Use Analysis, handles the combination of action diagrams (can be compared with PCODE) and data accesses.

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