In the Schema Editor, you can compare files to see only those things that exist in one file but that have been deleted in the other; these deletions are called tombstones. Because this type of comparison only checks for objects that exist in the second file you select that do not exist in the first file, tombstone detection typically runs faster than full comparisons.
After tombstone detection is complete, you can select the type of view that you want to use to view the tombstones on the View tab of the View File Type Instructions dialog box. In the view you select, you can only see Delete instructions for those objects that exist in the second file you selected, but not in the first file.
For example, when you compare two data files, you can view the Delete instructions in the Data Instructions Tree/Table window. In the following graphic, the Delete_E114A object is selected. The properties for the instruction object show the Class, UID, and Name of the object to be deleted.
To detect and view tombstones for a data file, do the following:
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Open the data file to which you want to compare another file.
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Click File > Compare with File > Data File > Detect Tombstones.
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Browse to the data file that you want to compare to the file you opened previously.
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In the View File Type Instructions dialog box, click the view in which you want to display the tombstones.
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Click OK.
You can save instructions by clicking File > Save > [FileType] Instructions, where [FileType] is the type of file for which you want to save instructions. For
example, to save data instructions, click Data Instructions on the Save submenu.