display-size of parent flow object

Subject: display-size of parent flow object
From: Alexander Taranov <tay@xxxxxxxxxx>
Date: Fri, 11 Jul 97 12:01 MSD
Is it possible in DSSSL to get display-size of parent 
I mean something like

(make <some container FO>
  (make external-graphics
	max-width: <display-size of my container>
	system-id: "FOO.EPS"))

A far as i inderstand (display-size) can only give me
length-spec of value FO.

Or maybe it is possible to construct an object of the
type length-spec which is based on actual length?
something like (make-length-spec 500pt) ?

Alexander Taranov

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