[xml] Text-Entities and Namespaces?

[Morus Walter <morus walter tanto-xipolis de>]

Hi,

though the following sample is connected to xslt, the problem itself
seems to be a libxml issue, so I write here:

I was trying to beautify some xslt output be adding linebreaks in the
stylesheet. Now I didn't want to write <xsl:text>&#x0a;</xsl:text>
for every line feed, so I decided to use an entity instead.
That is, I added 
<!DOCTYPE xsl:stylesheet [
  <!ENTITY LF '<xsl:text>&#x0a;</xsl:text>'>
]>
to the stylesheet.

Unfortunately libxml seems to have a problem with the namespace, used
in the entity:

The complete stylesheet is
--- test.xsl ---
<?xml version="1.0"?>
<!DOCTYPE xsl:stylesheet [
  <!ENTITY LF '<xsl:text>&#x0a;</xsl:text>'>
]>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>

  <xsl:output indent="no" encoding="ISO-8859-1" method="xml"/>
      
  <xsl:template match="bla">
    <out>&LF;
      <xsl:apply-templates/>
    &LF;</out>
  </xsl:template>
</xsl:stylesheet>
----------------
and I have some xml file
--- test.xml ---
<bla>fasel</bla>
----------------

When I call xsltproc I get
Entity: line 1: warning: Namespace prefix xsl is not defined
<xsl:text>
        ^
compilation error: file test.xsl line 1 element text
Namespaces prefix Ìôÿ¿sí`ehR` Ìôÿ¿aí`@tõÿ¿#¨# used for multiple namespaces
compilation error: file test.xsl element text
Namespaces prefix Ìôÿ¿sí`ehR` Ìôÿ¿aí`@tõÿ¿#¨# used for multiple namespaces
<?xml version="1.0" encoding="ISO-8859-1"?>
<out><text/>fasel<text/></out>

One can get around this problem by defining the namespace within the 
entity (<!ENTITY LF '<xsl:text xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>&#x0a;</xsl:text>'>).

Xalan however does not require such means:
(1221 ~/libxml) xalan -Q -XSL test.xsl -IN test.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<out>
fasel
</out>


xmllint --noent test.xsl
complains about an undefined namespace and drops the prefix.
(1223 ~/libxml) xmllint --noent test.xsl
Entity: line 1: warning: Namespace prefix xsl is not defined
<xsl:text>
        ^
...
    <out><text>
</text>
      <xsl:apply-templates/>
    <text>
</text></out>
...