Subject: Re: Contents present? Apparently simple but ... From: MARK.WROTH@xxxxxxxxxxx (Wroth, Mark) Date: Wed, 15 Dec 1999 07:39:08 -0800 |
In response to my question > I'm trying to test for the existence of element content so that I can do > conditional processing on an element. > > I would have said > > (if (data (current-node) > ( -- branch 1 --) > ( -- branch 2 --)) > > would do what I want. However, branch 1 always gets executed, whether the > element is empty or not. Matthias Clasen <clasen@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> pointed out MC>If there is no data, (data ...) returns an empty string. But every object MC>except #f counts as a true value in DSSSL. and Jany Quintard <quintard.j@xxxxxx> further commented that JQ>data returns a string, so if there is no data, it should return an empty JQ>string. But this is not equal to #f JQ>I would try try something like : JQ> JQ> (if (equal? (data (current-node)) "") JQ> ( -- branch 2 --) JQ> ( -- branch 1 --)) JQ> JQ>I am not sure that "" is a correct expression for empty string. Between these comments, I think I see how to get to where I want to be. Thank you both. Mark DSSSList info and archive: http://www.mulberrytech.com/dsssl/dssslist
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