[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: Understanding Identity Transformations

Subject: Re: Understanding Identity Transformations
From: "Joris Gillis" <roac@xxxxxxxxxx>
Date: Sat, 12 Feb 2005 11:30:49 +0100
Re:  Understanding Identity Transformations
Tempore 23:56:58, die 02/11/2005 AD, hinc in xsl-list@xxxxxxxxxxxxxxxxxxxxxx scripsit Karl Stubsjoen <kstubs@xxxxxxxxx>:

Seems like this is pretty standard:

SAMPLE_001:
<xsl:template match="node()|@*">
  <xsl:copy>
    <xsl:apply-templates select="@*"/>
    <xsl:apply-templates/>
  </xsl:copy>
</xsl:template>

But then I've also seen this:

SAMPLE_002:
<xsl:template match="/ | @* | node()">
   <xsl:copy>
     <xsl:apply-templates select="@* | node()"/>
   </xsl:copy>
</xsl:template>

How do they compare?  I make not of the SAMPLE_001 within the xsl:copy
there are 2 apply templates, what does each do?

Since <xsl:apply-templates/> is an abbreviation for <xsl:apply-templates select="node()"/>, and attributes occur first in document order, the two consecutive 'apply-templates' of the first simple do exactly the same as the one 'apply-templates' in sample 2.


As for the extra '/' in the second sample, I don't think it is necessary.

Then, understanding what is happening, is the following sample true
that this will strip an XML doc of all attribute elements?

SAMPLE_003:
<xsl:template match="*">
  <xsl:copy>
    <xsl:apply-templates select="*"/>
  </xsl:copy>
</xsl:template>

Yes indeed, it will strip off attributes BUT also text nodes, comments, processing instructions...
(only elements will remain)



And finally, when I identity transform the following my document i
quadrupled in size, but I though I was following standard practices
from previous example.

SAMPLE_004:
<xsl:template match="*">
  <xsl:copy>
    <xsl:apply-templates select="*"/>
    <xsl:apply-templates />
  </xsl:copy>
</xsl:template>



Ahh, I think I understand what is going on in SAMPLE_004 (please
confirm) I am basically applying templates for all nodes twice

Not entirely true. You first apply templates to all child element nodes. And then you apply all child node (including again the elements)



regards, -- Joris Gillis (http://www.ticalc.org/cgi-bin/acct-view.cgi?userid=38041) Gaudiam omnibus traderat W3C, nec vana fides

Current Thread

PURCHASE STYLUS STUDIO ONLINE TODAY!

Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
Email
First Name
Last Name
Company
Subscribe in XML format
RSS 2.0
Atom 0.3
Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.