Inserting XREFs

[Jaysen Long]

Yvan Bergeron posted the following question in .r14general:

From the command line, how can one Bind an Xref with the insert option
instead of the Bind option?

I wrote a routine which would Detach an XREF and then INSERT it back
into the drawing with the same insertion point, scale, and rotation.

What I found was this:

3 drawings -- Drawing UTIL, Drawing PLAN, Drawing X

Open Drawing UTIL, XREF Overlay Drawing PLAN

Open Drawing X, XREF Overlay Drawing PLAN

Now, if you INSERT Drawing UTIL and EXPLODE it, you'll end up with 2
XREF copies of Drawing PLAN.

If, in Drawing X, you have an empty drawing (no XREFs), then INSERT
Drawing UTIL, PLAN is converted to a "standard block", but it is null
(no entities).

How does the XREF Bind/Insert dialog box do it? Is it possible with
lisp?

Jaysen