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Re: [xml] Possible bug in 2.7.2

On Thu, Oct 30, 2008 at 12:43:16PM -0700, Dave Connet wrote:
> In generating some xslt, I think I've come across a bug...
> test.xml:
> <?xml version="1.0" encoding="UTF-8"?>
> <?xml-stylesheet type="text/xsl" href="test.xsl"?>
> <Root PathName="C:\Test Dir\">
> <Note id="Id1"/>
> </Root>
> 
> test.xsl
> <?xml version="1.0"?>
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> version="1.0">
> <xsl:output method="html" encoding="UTF-8"/>
> <xsl:template match="/">
>  <xsl:apply-templates />
> </xsl:template>
> <xsl:template match="Root">
>  <HTML>
>   <head><title>Header</title></head>
>   <BODY>
>    <xsl:value-of select="/Root/@PathName"/><br/>tes
>    <xsl:apply-templates select="Note"/>
>   </BODY>
>  </HTML>
> </xsl:template>
> <xsl:template match="Note">
>  <img>
>   <xsl:attribute name="width">415</xsl:attribute>
>   <xsl:attribute name="height">10</xsl:attribute>
>   <xsl:attribute name="src"><xsl:value-of
> select="/Root/@PathName"/>images/myImage.gif</xsl:attribute>
>  </img>
>  <xsl:value-of select="@id"/><br/>
> </xsl:template>
> </xsl:stylesheet>
> 
> Both xalan and IE (browser,v7) produce the same results. xsltproc
> doesn't:
> Using xalan:
> <HTML>
> <head>
> <META http-equiv="Content-Type" content="text/html; charset=UTF-8">
> <title>Header</title>
> </head>
> <BODY>C:\Test Dir\<br>tes
>    <img width="415" height="10" src="C:\Test
> Dir\images/myImage.gif">Id1<br>
> </BODY>
> </HTML>
> 
> Using xsltproc:
> <HTML>
> <head>
> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
> <title>Header</title>
> </head>
> <BODY>C:\Test Dir\<br>tes
>    <img width="415" height="10"
> src="C:%5CTest%20Dir%5Cimages/myImage.gif">Id1<br>
> </BODY>
> </HTML>
> 
> A posting on the xslt list mentioned that this could probably be
> considered a bug in libxml2 - and pointed to htmlAttrDumpOutput in
> HTMLtree.c.

  libxml2 knows that the src attribute of img tag is an URI-Reference
and applies the URI-Reference escaping algorithm.
  Your problem is that what you are giving as src attribute value is
a windows path and not an URI-Reference, that's the core of your problem
a windows path should not be put as an URI reference in an HTML page.

> I'm not sure what the proper fix should be - I know in my case, simply
> adding '\' and ' ' to the excluded chars would fix the above. I don't
> know what other effects that might have... (and my generating code can
> easily change '\' to '/' before generating the xml, needing only the
> space added to the excluded chars then)

  use a file:/// based URI to express your path

Daniel

-- 
Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
daniel veillard com  | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library  http://libvirt.org/
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