Extended Data-Handling Functions Reference (AutoLISP)

The following table provides summary descriptions of the AutoLISP extended data-handling functions.

Extended data-handling functions
Function	Description
(regapp application)	Registers an application name with the current AutoCAD drawing in preparation for using extended object data
(xdroom ename)	Returns the amount of extended data (xdata) space that is available for an object (entity)
(xdsize lst)	Returns the size (in bytes) that a list occupies when it is linked to an object (entity) as extended data