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rupeshraju

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Joined: 17 Aug 2004
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PostPosted: Tue Aug 17, 2004 2:29 pm    Post subject: about map's
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can anybody help me to find out what is the difference between a sybolic map and a physical map
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nsatish2000

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Joined: 17 Aug 2004
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PostPosted: Tue Aug 17, 2004 7:24 pm    Post subject: reply
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Physical Map

The primary objective of the physical map is to ensure the device independence in the application programs. More concretely, for input operations, the physical map defines maximal data length and starting position of each field to be read and allows BMS to interpret an input data stream. For output operations, the physical map defines starting position, length, field characteristics (Attribute Bytes) and default data for each field, and allows BMS to add control characters and commands for output in order to construct an output data stream.


Symbolic Map 8)
The primary objective of the BMS symbolic map is to ensure the device and format independence to the application programs. Therefore, through the symbolic map, a layout change in the formatted screen can be done independent of the application program coding as long as the field name and length remain same.

It is used by the application program which issues a COBOL COPY statement in order to include a symbolic map in the program.
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