The area defined by a CLIP attribute is cut from a file and inserted into the IDF document.

CLIP="fieldname"

or

CLIP="left,top,right,bottom" (deprecated).

If there are no commas, then the parameter is assumed to be a fieldname whose boundaries are used to set up the 'clip region'.

The top left corner of the resulting area is positioned at the LEFT (or X) and TOP (or Y) position.