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[xslt] xsl:import and attribute-set precedence

hello,

I stumbled onto what I think is an libxslt bug. I'm trying to make a
stylesheet easily customizable by using attribute sets. the idea is just like
the example at http://www.w3.org/TR/xslt#import, to let another sheet import
it and set some attributes differently.

it appears libxslt doesn't handle the precendence as I would expect from
reading the specification.

take foo.xml:

<?xml version="1.0" encoding="ISO-8859-1"?>
<blah>
</blah>

and foo1.xsl:

<?xml version="1.0"?>
  <xsl:output method="html"/>

  <xsl:attribute-set name="blah-style">
    <xsl:attribute name="size">+1</xsl:attribute>
  </xsl:attribute-set>

  <xsl:template match="/">
    <font xsl:use-attribute-sets="blah-style">foo</font>
  </xsl:template>
</xsl:stylesheet>

and foo2.xsl:

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:import href="foo1.xsl"/>

<xsl:attribute-set name="blah-style">
  <xsl:attribute name="size">+2</xsl:attribute>
</xsl:attribute-set>

</xsl:stylesheet>

now, running foo1.xsl I expect and get:

lodewijk$ xsltproc foo1.xsl foo.xml
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<font size="+1">foo</font>

okay. now, running foo2 I'd expect +2, not +1, but:

lodewijk$ xsltproc foo2.xsl foo.xml
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<font size="+1">foo</font>

the same. OTOH, XT gives what I expect:

lodewijk$ kaffe -classpath /usr/share/kaffe/Klasses.jar:/usr/share/java/repository com.jclark.xsl.sax.Driver foo.xml foo2.xsl
<font size="+2">foo</font>

as does Xalan. xsltproc -v shows it does try to update the attribute set, but
apparently that doesn't work:

lodewijk$ xsltproc -v foo2.xsl foo.xml
Added namespace: xsl mapped to http://www.w3.org/1999/XSL/Transform
xsltPrecomputeStylesheet: removing ignorable blank node
xsltParseStylesheetProcess : found stylesheet
Added namespace: xsl mapped to http://www.w3.org/1999/XSL/Transform
xsltPrecomputeStylesheet: removing ignorable blank node
xsltParseStylesheetProcess : found stylesheet
creating attribute set table
add attribute to list blah-style
updated attribute list blah-style
xsltCompilePattern : parsing '/'
xsltCompilePattern : parsed /, default priority 0.500000
added pattern : '/' priority 0.500000
parsed 1 templates
creating attribute set table
add attribute to list blah-style
updated attribute list blah-style
parsed 0 templates
Initializing keys on foo.xml
Registered 0 modules
Registering global variables
Registering global variables from foo2.xsl
Registering global variables from foo1.xsl
apply attribute set blah-style
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
"http://www.w3.org/TR/REC-html40/loose.dtd">
<font size="+1">foo</font>

is this a bug, or am I misunderstanding things?

Lodewijk
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