Sikuli Java: Find image given coordinates

I am trying to create an application that reads an XML file and extracts the coordinates of buttons in a display. To automate the testing, I want to take those coordinates and tell Sikuli to look for an image in those coordinates and click at location (x,y)..

I am new at Sikuli, have played around with the IDE, but im trying to create an application in Java with Eclipse and I cant find any reference to it.

I need help: telling SIkuli to click on the screen given (x,y) coordinates, and not an image file.

Any help would be greatly appreciated!