Re: Perform, and xsl:import puzzles

[Simon Woodside]

This might help, from the XSL FAQ:
    http://www.dpawson.co.uk/xsl/sect2/sect21.html
simon

xsl:import vs xsl:include
        
Tony Graham

There are differences. Stylesheets that you reference with 
xsl:import have a lower "import precedence" than the importing 
stylesheet, whereas stylesheets you reference with xsl:include are 
almost completely treated as if you'd copied the referenced file and 
pasted it into your stylesheet at that point.

For example, if you had template in both the main and the referenced 
stylesheet with the same match pattern. With xsl:import, you 
wouldn't get a conflict because the main stylesheet has higher 
"import precedence" (plus there's rules about import precedence of 
multiple imported stylesheets). With xsl:include, you would get an 
error because the template in the referenced stylesheet is treated 
as if it were in the main stylesheet, and two templates matching the 
same pattern will cause an error. Mike Kay added: The differences 
are to do with the handling of precedence if several stylesheets 
declare the same object.

I quite agree that it seems crazy to have two such strongly 
overlapping features: it looks from the outside like a classic 
committee compromise, and frankly the reason I delayed implementing 
it for so long in SAXON was that I thought any sensible committee 
(is there such a beast?) would rationalise the spec in this area. My 
optimism seems to have been unfounded.


On Sunday, October 12, 2003, at 01:31  AM, Christian Jaeger wrote:

Hello

I'm using AxKit::XSP::PerForm for the first time.

- the included perform_html.xsl file is incomplete, it misses the 
following template:

<xsl:template match="file_upload">
  <input type="file" name="[EMAIL PROTECTED]|[EMAIL PROTECTED]|index}">
    <xsl:if test="@accept or accept/text()">
      <xsl:attribute name="accept"><xsl:value-of 
select="@accept|accept"/></xsl:attribute>
    </xsl:if>
  </input>
  <xsl:apply-templates select="error"/>
</xsl:template>

- I have problems with xsl:import.
  Ok, there are 3 ways using perform_html.xsl:
  (1) using it directly: cp perform_html.xsl perfhtmlcopy.xsl; remove 
comment around the default template, and put above file_upload 
template into perfhtmlcopy.xsl. This works.
  (2) using an own stylesheet.xsl, and <xsl:include 
href="perform_html.xsl"/>. This works as well.
  (3) using an own stylesheet.xsl, and <xsl:import 
href="perform_html.xsl"/>. This does not work, the html output looks 
like the perform_html.xsl would not have been seen at all.

No error in the logs, just these debug messages:
...
LibXSLT match_uri: /xsl/perform_html.xsl
LibXSLT open_content_uri: /xsl/perform_html.xsl
Style Provider Override: Apache::AxKit::Provider::File
decoding from UTF-8
[req] File Provider given $r: /home/dav/Site1_dev/xsl/perform_html.xsl
encoding to UTF-8
[LibXSLT] performing transformation
...
So libxslt fetches the xsl:import'ed sheet, but then does just as it 
has not seen it at all and only applies the templates from the parent 
sheet.

This is my parent sheet: is the default template a problem?:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">
  <xsl:import href="/xsl/perform_html.xsl"/>

  <xsl:output method="html" encoding="iso-8859-1"/>

<xsl:template match="*|@*">
  <xsl:copy>
   <xsl:apply-templates select="@*"/>
   <xsl:apply-templates/>
  </xsl:copy>
</xsl:template>
<xsl:template match="file_upload">
  <input type="file" name="[EMAIL PROTECTED]|[EMAIL PROTECTED]|index}">
    <xsl:if test="@accept or accept/text()">
      <xsl:attribute name="accept"><xsl:value-of 
select="@accept|accept"/></xsl:attribute>
    </xsl:if>
  </input>
  <xsl:apply-templates select="error"/>
</xsl:template>

<xsl:template match="error">
  <span class="form_error">FFF <xsl:value-of select="."/></span>
</xsl:template>
</xsl:stylesheet>

Thanks for any enlightment
christian.
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