Re: Labels and content-map

[James Clark <jjc@xxxxxxxxxx>]

With my current sources, this does output just "This is an A". I fixed a bug
in sosofo-discard-labeled a while ago; I suspect that's the problem.

At 15:18 22/05/97 -0400, Paul Prescod wrote:
>I want to move some labeled flow objects before unlabeled ones in the
>output of a document. The only way I could figure out how to do that is
>to make two copies of the flow object tree, add labels to the elements
>without, and then discard them based on their labels. There may be a
>more elegant way, and I would like to know it, if there is, but I would
>also like to know why this way doesn't work. In the example below I will
>try to attack half of the problem, outputting only the flow objects
>labeled 'a . But Jade doesn't output them.
>
><!DOCTYPE FOO [
>	<!ELEMENT FOO O O (A,B,C)>
>	<!ELEMENT A - O EMPTY>
>	<!ELEMENT B - O EMPTY>
>	<!ELEMENT C - O EMPTY>
>]>
><A>
><B>
><C>
>
>---
><!doctype style-sheet PUBLIC "-//James Clark//DTD DSSSL Style
>Sheet//EN">
><!-- test.dsl -->
>
>(element a (make sequence label: 'a (literal "This is an A")))
>
>(element b (literal "This is a B")) ;; no label 
>
>(element c (literal "This is a C")) ;; no label
>
>(element foo
>	(let* ((flow-children (process-children))
>		(a-and-non-a-labels (sosofo-label flow-children 'non-a))
>		(only-a-elements (sosofo-discard-labeled 
>			a-and-non-a-labels 'non-a)))
>
>		(make simple-page-sequence
>			(make paragraph content-map: '((a #f)) 
>				only-a-elements))))
>
>I thought that that code would add the label 'non-a to all flow objects
>*except* the one already labelled 'a and would then discard the non-a
>flow objects. Instead I get an empty document. Am I doing something
>wrong or is this a Jade bug?
>
> Paul Prescod


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