Tag of the object - sketch curves, edge,
datum plane, datum axis, NX curves

Object associativity type:
UF_SKET_end_point;
UF_SKET_arc_center -
object must be an arc;
UF_SKET_tangency -
object must be an arc;
UF_SKET_curve_point -
object must be a spline
UF_SKET_anchor_point -
object must be a sketch conic

Object associativity modifier:
UF_SKET_first_end_point or UF_SKET_last_end_point
if object_assoc_type = UF_SKET_end_point;
Not Used
if object_assoc_type = UF_SKET_arc_center or
UF_SKET_anchor_point;
parameter percentage (0 - 100) (used to find approx tgt pt)
if object_assoc_type = UF_SKET_tangency;
the index number of the defining point of the spline(starting from 1)
if object_assoc_type = UF_SKET_curve_point;