Using segment/layout cross-reference

Option 7, XREF, is used to create and maintain segment/layout cross-references (XREFs) for use in the File-AID for IMS/ISPF Browse, Edit, Extract, Print, and Selection Criteria functions, File-AID for IMS/FLEX option functions, and also in the File-AID for IMS/DC/CICS Batch XREF Update Facility. The purpose of a segment/layout XREF is to associate a COBOL or PL/I segment layout with each segment type in a database. The XREF function uses your existing DBD load module members to determine the segment types in the database and then prompts you to enter the corresponding segment layout members for each segment type.

In addition, you can specify segment layout information associated with logical child and concatenated segments defined in the DBD and for segment types with multiple formats (that is, those segment types that require more than one segment layout to define the segment data). You can also use the XREF function to isolate the appropriate layout if multiple segment layouts are contained within a single COBOL or PL/I member or if the segment layout is hard-coded in a COBOL or PL/I program.

Important

For XREF processing in a COPE environment, each LSYS may have a different DBD structure for the same real DBD name. As a consequence, separate XREF datasets may be required to map the correct underlying COPE database structures.

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