Information Technology Reference
In-Depth Information
The TDL statements are
FORM NAME FROM NAME
FORM LIC#
1
FROM LIC#
1
:
FORM PERSON IF PERSON
FORM CARS IF CAR AND ACCIDENT
There are many possible kinds of translation rules. The IF statement indicates the
conditions that one might want to check while restructuring; for example, duplica-
tion and invalid values.
The data conversion problem can basically be resolved by available software
tools. However, these tools are DBMS dependent and are supplied by the vendors
only. A more generalized tool for data conversion is needed.
4.3
Translator Generator Approach
The translator reads the source definition, the target definition, and the mapping
definition, and then generates a specialized program that will reformat and map the
stored data from source to target as illustrated in Fig.
4.3
.
Definitions of
source, target,
and mapping
Translator
generator
Specialized
program
source
target
Fig. 4.3
Translator generator
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