Re: Identity Transform

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Subject: Re: Identity Transform
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Mon, 22 Sep 2003 17:06:46 -0400

Abie,

At 04:28 PM 9/22/2003, you wrote:

why does the standard identity transform use copy instead of copy-of?

Since it proceeds down the tree step by step, it is a trivial matter to amend the identity transform with your own tree-tweaking logic:

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

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

Put these two together and you get a stylesheet which takes arbitrary input and returns it as the result -- except all <broken> elements, at any level, are now <fixed>.

The copy-of method is, of course, more efficient if you actually need to clone a subtree, rather than copy-it-mostly-except, which is what most applications of an identity transform actually need to do.

Cheers,
Wendell

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

instead of just
 <xsl:template match="/">
   <xsl:copy-pf select="."/>
 </xsl:template>

======================================================================
Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc.                http://www.mulberrytech.com
17 West Jefferson Street                    Direct Phone: 301/315-9635
Suite 207                                          Phone: 301/315-9631
Rockville, MD  20850                                 Fax: 301/315-8285
----------------------------------------------------------------------
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======================================================================

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Current Thread

Identity Transform
- Abie Hamaoui - Mon, 22 Sep 2003 16:29:37 -0400 (EDT)
  - Adam Turoff - Mon, 22 Sep 2003 17:10:17 -0400 (EDT)
  - Wendell Piez - Mon, 22 Sep 2003 17:11:59 -0400 (EDT) <=
  - Dimitre Novatchev - Wed, 24 Sep 2003 00:44:36 -0400 (EDT)
  - <Possible follow-ups>
  - Passin, Tom - Mon, 22 Sep 2003 16:46:59 -0400 (EDT)
  - Abie Hamaoui - Tue, 23 Sep 2003 10:31:12 -0400 (EDT)
    - David Carlisle - Tue, 23 Sep 2003 11:19:17 -0400 (EDT)

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