C:\DITA\WKFS_oXygen_Files\fragments\webhelp.fragment.head.xml
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# Compare with Common Base

Selecting the context menu item Compare with Common Base from the REQ Diffs Window allows you to compare the existing customized version of the selected document with the Common Base version.

The selected document is displayed with the Common Base version on the left side of the window and the Existing version on the right.

The synchronized scroll bars on the right side of the window provide a visual clue as to locations within each version that contain identified differences.

## Updating Removed DTAs to Custom

During the pre-merge process, any DTAs that are removed from the base but still required by the custom content are updated to be custom DTAs. This activity is tracked in the MergeResultsCompileLog log file.
C:\DITA\WKFS_oXygen_Files\fragments\webhelp.fragment.after.body.xml