dbfo-need height and FOP

["Antti Karanta" <antti.karanta@napa.fi>]

                    Hi!

   It seems that when fop.extensions or fop1.extensions are on dbfo-need  
processing instruction (used for soft page breaks) is ignored.

   I found this bug report:

https://sourceforge.net/tracker/index.php?func=detail&aid=2816141&group_id=21935&atid=373747

   and this thread:

http://www.mail-archive.com/docbook-apps@lists.oasis-open.org/msg13096.html
   (I believe the problem in the sample given in this thread is that  
dbfo-need is mentioned here:  
http://www.sagehill.net/docbookxsl/PageBreaking.html "Because the  
mechanism uses blocks, you cannot put the processing instruction inline.  
It must be between elements that generate blocks of text, otherwise you  
may get invalid XSL-FO.")

   However, if I comment out the parts that cause fop to be ignored in  
fo/pi.xsl the said processing instruction seems to work as intended. Well,  
almost - if there is no page break caused, the text continues a little  
down from where it should be. But there are no validation errors mentioned  
in the bug report.

   So, the question is: what situations does this cause problems in when  
using fop?


   using docbook-xsl 1.75.1 and fop 0.95.



       ::Antti::



   Ps. Here's one of the small samples I experimented with:


<?xml version="1.0" encoding="UTF-8"?>
<book>
	<title>example</title>
	<preface>
		<title>foobar</title>
		<para>teskstii tekstii</para>
		<para>hiiohoi</para>
		<para>joopa joo</para>
		<para>paevaa ja yota</para>
		<?dbfo-need height="20mm" ?>
		<para>lissaa tekstii</para>
	</preface>
</book>