[note This is a note]
[tip This is a tip]
[important This is important]
[caution This is a caution]
[warning This is a warning]

generates DocBook admonitions:

	Note
	This is a note

	Tip
	This is a tip

	Important
	This is important

	Caution
	This is a caution

	Warning
	This is a warning

These are the only admonitions supported by DocBook. So, for example [information This is some information] is unlikely to produce the desired effect.