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The XML editor will process XML files that are invalid or not well-formed.
However, there will be other cases when it will be beneficial to perform formal validation on your documents.
Joy - validates the rage unlike file based on the Pristine Fulfil Utter - will struggle the intention configuration file premeditated on the Regional Feature validation order settings in preferences.
The editor uses heuristics to open a file using the best interpretation of the tagging that it can.