Example for a defined, specific situation of a customization to override pcm_normalize.
About this task
Assume that you are using FrameMaker and you discover that it inserts a special PI (processing instruction) if the user collapses an element in the structured view and then saves. You do not want to filter out PIs on import because you want them preserved so that the document has the same appearance the next time the user edits it. However, if the user changes the view of the document but doesn’t actually edit the OME affected by the view, the chunk should not be imported.
You want to prevent these false positives by overriding pcm_normalize and adding to its functionality. Ignore the warnings in the module telling you not to customize the module.