[TYPO3] Using COA for configuring one's extension

[Xavier Perseguers]

Hello,

Where can I find a doc or a basic example of an extension that renders 
something through a COA?

What I would like to achieve would be something like that:

plugin.my_extension_pi1 {
	parameter1 = COA
	parameter1.10 = TEXT
	parameter1.10 {
		field = myfield
		wrap = <strong>|</strong>
	}
}

I want TYPO3 to handle the COA itself, but call me back when dealing 
with a certain field such as "field = SONG:Artist" that should be 
handled by myself.

-- 
Xavier Perseguers
http://xavier.perseguers.ch/en/tutorials/typo3.html