Automatic Spell Check

To allow Oxygen XML Editor to automatically check the spelling as you write, you need to enable the Automatic spell check option from the Spell Check preferences page. Unknown words are highlighted and feature a contextual menu which offers the following actions:
Delete Repeated Word
Allows you to delete repeated words.
Learn Word
Allows you to add the current unknown word to the persistent dictionary.
Spell check options
Opens the Spell Check preferences page.
Also, a list of words suggested by the spell checking engine as possible replacements of the unknown word is offered in the contextual menu.
Related information
Learned Words