How To Configure the Upgrade Variables and Upgrade the DGN

Note: To run this upgrade, you must have the older schemas backed up to a location which will be defined in the procedure below.

Open the *.PCF file for the project to be upgraded (For example, ...\Workspace\Projects\OPModeler_Imperial.pcf)
Define the following variables in the file. By default, these variables are included in the sample projects which are provided with the OPM install.
- The value defined for the first configuration variable points to older version of the schemas (all schema directories must be specified)
```
OPM_UPGRADE_OLD_SCHEMA_PATHS = C:\OldOPMSchemas\OPModeler\schemas\;C:\OldOPMSchemas\Dataset\schemas\;
```
- Old schema version number Major and Minor (OPM_UPGRADE_OLD_SCHEMA_VER_MAJOR cannot be '0')
```
OPM_UPGRADE_OLD_SCHEMA_VER_MAJOR = 1
OPM_UPGRADE_OLD_SCHEMA_VER_MINOR = 4
```
- A Modification Map is used by the upgrade process. It has the following format:
  <CLASS_NAME_1>:<PROP_1>|<PROP_2>|<PROP_3>;<CLASS_NAME_2>:<PROP_1>|<PROP_2>;<CLASS_NAME_3>:<PROP_1>|<PROP_2>|<PROP_3>; ...
  
  Upgrade process will look for classes specified by the map, pick those objects in DGN, and update the properties specified in the map for that specific class.
```
OPM_UPGRADE_MODIFIED_MAP = MITERED_PIPE_BEND:BEND_POINT_RADIUS|;
```
Save and close the *.PCF file.
Open the older model and key in MECHADDIN UPGRADEDGN to upgrade.