RE: [xml] XSLTPROC is slow along with XSLT

[David Neary <David phenix fr>]

Hi Vikrant,

From: Vikrant Rathore 
> i have written an XSL file an also developed a small 
> application to convert 
> XML to XSLT. There has been real performance issue with XSLT. 

Your XSL is severely broken. Let me try to explain why...

> <xsl:stylesheet version='1.0' 
> xmlns:xsl='http://www.w3.org/1999/XSL/Transform' >
> <xsl:output method="text"/>

> <xsl:for-each select="//item">

This traverses the whole tree

> <xsl:text>D</xsl:text>
> <xsl:value-of select="//job_id"/>

So does this

<snip>

so do the rest of these //s
> </xsl:for-each>

So what you're getting is "Search the entire document for nodes called
"data", and for each one we find, search the entire document for elements
called "job_id", give me the text value of the first one, etc..."

This is extremely inefficient, and is also probably not what you want.

Assuming that your document looks something like this:

<action_calendar_data_exchange>
  <item>
    <job_id>12</job_id>
   ...
  </item>
  <item>
   ...
...
  </item>
</action_calendar_data_exchange>

try changing your stylesheet to 
<xsl:for-each select="item">
  <xsl:value-of select="job_id"/>
  <xsl:value-of select="customer_code"/>
  ...
</xsl:for-each>

Or at least changing the //s to .//s if there really is a need to search the
whole subtree. Adding the . means you're starting your search from the
currently selected node, and not from the root.

Regards,
Dave.