for invoque a expecific xmldialog in a book at use doble clik in this? thx

I'm not exactly sure what the question is. What book are you talking about? A questholder book?
And I'm not sure what you mean by invoking the xmldialog.
Do you want to activate an xmldialog that is on an npc when someone is carrying a questholder?

There is any way to start a xmldialog by doing a double-click on an item in my inventary? Instead of doing it by talking to a Npc

The xmldialogs can only be activated by movement or speech so you would have to have the item cause the player to speak which would then activate the xmldialog.
You could use an XmlUse attachment with a SuccessAction set to something like

SETONTRIGMOB/SPEECH/your dialog keyword

which would cause the player to speak the xmldialog-triggering keyword when double clicked.

I like the idea of being able to externally activate the dialogs though. I'll think about that.