Parameter syntax:
lower | upper | capital
Converts case of text selection or all text contained in selected node. If there is no selection, converts case from caret position to end of word.
Note that in XXE, a word is ended by a XML space character of by end of textual node whichever comes first.
characters are converted to lower-case characters.
characters are converted to upper-case characters.
first character of a word is converted to an upper-case character.