Base Maps

A map can be based on another map and this map can be based on yet another map. To understand the complete map you must follow the chain of base maps.

For more information about the construction of a map, choose Mappings > Descriptions > Xref and Mappings > Tables > Xref from the NLS Administration menu. Choose the map or table whose lineage you want to see.

For example, the map C0-CONTROLS is a single-byte character set map using the C0-CONTROLS table. It maps the set of 7-bit control characters. The description report will tell you that just about every other map has C0-CONTROLS in its lineage, while it is the base map for C1-CONTROLS and ASCII.