Enterprise Administration > Windchill Export and Import > Import and Export Policies, Mapping Rules, and Conflict Messages > Mapping Through Special Rules
  
Mapping Through Special Rules
You can write mapping rules to apply to a specific export or import process, or to a set of export or import processes. The rules reside in one or both of the two types of ASCII XML files that can include properties to control import and export operations:
Client-based files—You select these files by browsing in the graphical user interface. These mapping rules file can have any name and can be located anywhere that the software can access and read them. These files take precedence if they conflict with generalized files.
Generalized files—These files provide rules for either import operations or export operations. Their names must end in .xml. They are in one of two locations whose names define their functions:
\Windchill\codebase\registry\ixb\export_settings

\Windchill\codebase\registry\ixb\import_settings
You set properties in mapping rules files by editing the files, and you cannot use the xconfmanager utility for this purpose. If you do not set properties through a graphical user interface or in a mapping file, you add or edit properties with the xconfmanager utility. For more information, see Using the xconfmanager Utility.
Examples of both types of files are included in the next two sections. After the examples, there are sections about properties and rules, including rule examples.