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From Ugo Cei <u....@cbim.it>
Subject Order of namespace declarations for taglibs?
Date Thu, 04 Oct 2001 07:39:23 GMT
Hi people,

I posted this question on the users list three days ago, but got no 
reply, so I thought I'd better bother you :). In the meantime I 
partially solved the problem but uncovered a possible bug in C2.RC1a (or 
Xerces or Xalan).

........................................................
I have a problem in C2.0rc1a with one of my logicsheets. This logicsheet 
uses another builtin taglib, like for instance xsp-request (please have 
a look at the attached test.xsl file). The problem is that the elements 
of the xsp-request taglib are NOT expanded by the XSP generator, so they 
are copied verbatim to the output. The attached test1.xsp file, when 
processed, produces the output that is contained in the attached 
test1.xml file.

This only happens with the RC1a release, whereas everything works 
correctly with 2.0b2. The funny thing is that, if you restart the 
servlet container and remove all work files, it works correctly with 
2.0rc1a but ONLY THE FIRST TIME the page is requested. If you reload the 
page, the bug manifests itself.

I have verified this behavior with Tomcat 4.0 under Linux and with 
Tomcat 3.2.3 under Solaris 8 (BTW, I cannot compile mod_webapp under 
Solaris 8, so I am forced to use Tomcat 3.2.3, but this is a problem for 
the Tomcat list).
........................................................

Having had no reply, I tried to change the order of namespace 
declarations and "fixed" the problem. I have concluded that, if the 
"test" taglib logicsheet uses the "xsp-request" taglib, everything works 
ONLY if, in the XSP document, the namespace declaration for "test" comes 
BEFORE the namespace declaration for "xsp-request". That is, in the 
attached test1.xsp file, change

<xsp:page language="java"
           xmlns:xsp="http://apache.org/xsp"
           xmlns:xsp-request="http://apache.org/xsp/request/2.0"
           xmlns:log="http://apache.org/xsp/log/2.0"
           xmlns:test="http://caterina.cbim.it/xsp/test/1.0">

to

<xsp:page language="java"
           xmlns:xsp="http://apache.org/xsp"
           xmlns:log="http://apache.org/xsp/log/2.0"
           xmlns:test="http://caterina.cbim.it/xsp/test/1.0"
           xmlns:xsp-request="http://apache.org/xsp/request/2.0">


Under C2b2 this is not the case, the order does not matter.

I was under the impression that the order of namespace declarations is 
irrelevant in XML and that parsers and/or XSLT processors are not 
required to report them to the application in any particular order. 
Should this behavior be classified as a bug or as an undocumented 
feature? ;)

	Best Regards,

		Ugo


-- 
Ugo Cei - Consorzio di Bioingegneria e Informatica Medica
P.le Volontari del Sangue, 2 - 27100 Pavia - Italy
Phone: +39.0382.525100 - E-mail: u.cei@cbim.it

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