Oh you always answer me Dave, again thank you very much.
In fact The user open a file User.txt and write into the text which he wants to place. (See attachment).
And after that, my border outline filled. I write in an existant file.osm. So I already place the symbol "border outline". Basically I already re-center it. What kind of function could modify the text property?
I have to automatize that in my SKILL code.