Re: length-spec vs. length for characteristics

Subject: Re: length-spec vs. length for characteristics
From: James Clark <jjc@xxxxxxxxxx>
Date: Sun, 20 Apr 1997 17:44:11 +0700
At 11:15 17/04/97 -0400, Paul Prescod wrote:

>How major are the changes to DSSSL going to have to
>be to allow us to work online where flow object sizes (e.g. page width)
>are not known until runtime?

The whole point of length-specs is that they allow the user to express
characteristic values in terms of quantities such as page-width that are not
known to the DSSSL engine.  This works because the set of operations that
are allowed on length-specs is limited.  Normal length-specs (not in tables)
can always be reduced to the form:

q + r*d

where q is a length, r is a float and d is the display-size.  For a
length-spec valued characteristic Jade will pass q and r to the backend.


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