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You do not declare a DataTable as if you were declaring a record or data item. Instead, any code that can access a DataTable can treat that part as a variable. For details on part access, see References to parts.
Any code that can access a DataTable has the option of referencing the part name in a Use declaration.
The output of DataTable generation is a pair of files, each named for the DataTable. One file has the extension .java, the other has the extension .tab. The .tab file is not processed by the Java™ compiler, but is included in the root of the directory structure that contains the package. If the package is my.product.package, for example, the directory structure is my/product/package, and the .tab file is in the directory that contains the subdirectory my.
You do not need to generate DataTables if you are generating into a package to which you had previously generated the same DataTables.
To save generation time when you do not need to generate DataTables, assign NO to the build descriptor option genTables.
Related concepts
References to parts
Related reference
DataTable part in EGL source format
Use declaration