About Mapping Services › Mapping Services, Mapping Support, and NCL Processing

Mapping Services, Mapping Support, and NCL Processing

Before structures can be referenced within an MDO by name from NCL, a map must be assigned to the MDO. The map provides NCL with the following information about an MDO:

• The type of structures which can be expected within the MDO data
• How to locate and recognize these structures
• The names which will be used in NCL to reference these structures

Maps defined to Mapping Services are loaded automatically the first time they are referenced from NCL. They can also be loaded manually by entering the LOAD MAP=mapname command.

The LOAD MAP command will only load a map not already in memory. To reset a map in memory (for example, after modifying an existing map), use the UNLOAD MAP=mapname command. It will be automatically reloaded on demand.