Advanced Customization > Services and Infrastructure Customization > Evolvable Classes > Examples of Generated Externalization Code for Evolvable Classes > Example of Version/UID Mapping Table
  
Example of Version/UID Mapping Table
The generator manages the release specific externalization by storing a table that maps each release to its externalization uid. This is stored in a comment block following the imports section of each source file. In the following example, the version column is the internal id for the release and the uid column is the externalization uid for the release version. As the UID changes, the table will be updated. A line will be added for each release version with its unique id.
//##begin version.uid preserve=yes

/* version uid

X-10 = 6676079877272797361L

*/

//##end version.uid