“Functions” are pre-defined and loaded along with the lexer that corresponds to the computer language of the file. There are three sets of candidate words that Notepad++ uses to create suggestions these are referred to as “words”, “functions” and “system paths”.

If more than one word in the list of candidate words matches what you’ve typed, Notepad++ will present a list containing the words the highlighted word in the list is the one that will be selected on the completion key, but you can use the Down- & Up-arrow keys, or PageDown & PageUp, to move through the list or, type Esc to dismiss the list.

If the suggested word is not what you want, keep typing. You accept the suggestion by typing the completion key (see “ Automatic completion”, below), and the word is completed within your buffer as if you’d typed it all out. For instance, if you’re coding in JavaScript and type syn, Notepad++ can present synchronized (a JavaScript keyword) as a suggestion. Notepad++ offers automatic completion of various sorts of text after you have entered an initial substring (or prefix), which can save you having to type all of a long word (and potentially save you mistyping it).

Auto format xml in notepad++