Integrated Data Dictionary Mapping Entities › Data Dictionary Entities Used by the Mapping Compilers

Data Dictionary Entities Used by the Mapping Compilers

When is the Data Dictionary Used?

The batch and online compilers retrieve information from and update information in the data dictionary at map compilation and map runtime:

• At map compilation, the batch and online compilers use map-related and table data dictionary entities, as follows:
  • Both map compilers verify that each specified occurrence is defined in the data dictionary.
  • Both compilers access information from record elements, such as the internal picture, external picture, or edit table defined for or associated with a map definition.
• At program runtime, application programs invoke map load modules as needed. A map load module can, in turn, invoke stand-alone tables and map help load modules stored in the load area.

Entities used by Compilers

The following data dictionary entities are used by the mapping compilers:

• Element occurrences
• Record occurrences
• Map occurrences
• Message occurrences
• Table occurrences
• Map and table load modules
• Help modules

The establishment, use, and/or modification of each of these entity occurrences is discussed, following a brief discussion of the builder codes used to identify the owner of many entity occurrences.