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Re: [xsl] Why are there no XSLT processors implemented in XSLT?


Subject: Re: [xsl] Why are there no XSLT processors implemented in XSLT?
From: Hermann Stamm-Wilbrandt <STAMMW@xxxxxxxxxx>
Date: Tue, 1 May 2012 18:05:45 +0200

Thanks Tony, that is really nice!

Same output (at bottom, besides XML-declaration).
Did run this on a 2.2GHz i7 processor, while naxos.xsl was running java
process had between 160% and 224% CPU utilization, which is reflected in
real vs user time.

As next step I wanted to see, whether naxos.xsl can run naxos.xsl ... :-)
But I got stopped at this very littly sample, further efforts seem
worthless:

$ cat ab.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xml" href="double.xsl"?>
<a>1<b>2</b>3</a>
$
$ cat double.xsl
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>
  <xsl:template match="/">
   <out>
    <xsl:copy-of select="."/>
    <xsl:copy-of select="."/>
   </out>
  </xsl:template>

</xsl:stylesheet>
$
$ java com.icl.saxon.StyleSheet -a ab.xml ; echo
<?xml version="1.0" encoding="utf-8"?><out><?xml-stylesheet type="text/xml"
href="double.xsl"?><a>1<b>2</b>3</a><?xml-stylesheet type="text/xml"
href="double.xsl"?><a>1<b>2</b>3</a></out>
$
$ java com.icl.saxon.StyleSheet ab.xml ../naxos.xsl ; echo
<out></out>
$


naxos sample execution:
$ time java com.icl.saxon.StyleSheet user.xml ../naxos.xsl
<html><head><title>Spam for Schmidt</title></head><body>
  <p>Dear Frau Schmidt,</p>
  <p>We would like to invite you,
    as a resident of Germany,
    to review our new software package.</p>
  <p>Thank you.</p>
  <p>Yours sincerely,</p>
</body></html>
real	0m6.360s
user	0m11.512s
sys	0m0.157s
$
$ time java com.icl.saxon.StyleSheet -a user.xml
<?xml version="1.0" encoding="utf-8"?><html><head><title>Spam for
Schmidt</title></head><body>
  <p>Dear Frau Schmidt,</p>
  <p>We would like to invite you,
    as a resident of Germany,
    to review our new software package.</p>
  <p>Thank you.</p>
  <p>Yours sincerely,</p>
</body></html>
real	0m0.274s
user	0m0.377s
sys	0m0.031s
$

Mit besten Gruessen / Best wishes,

Hermann Stamm-Wilbrandt
Level 3 support for XML Compiler team and Fixpack team lead
WebSphere DataPower SOA Appliances
https://www.ibm.com/developerworks/mydeveloperworks/blogs/HermannSW/
https://twitter.com/#!/HermannSW/
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  From:       "Tony Graham" <tgraham@xxxxxxxxxx>                                                                                              
                                                                                                                                              
  To:         xsl-list@xxxxxxxxxxxxxxxxxxxxxx,                                                                                                
                                                                                                                                              
  Date:       05/01/2012 04:24 PM                                                                                                             
                                                                                                                                              
  Subject:    Re: [xsl] Why are there no XSLT processors implemented in XSLT?                                                                 
                                                                                                                                              





On Tue, May 1, 2012 1:04 pm, David Carlisle wrote:
> On 01/05/2012 12:49, Costello, Roger L. wrote:
>> I will take the following as an axiom:
>>
>>        Programs written to process XML should be implemented in XSLT.
...
> The entire argument appears spurious, so it seems fruitless to try to
> argue specific points.
>
> Why would anyone even try to do this, even if it were possible, it would

To "[s]ee examples of what XSLT should never have been made to do." [1],
apparently.

How quickly we forget: [2].

> be vast amounts of work and would just produce an xslt engine that is
> slower than the one you started with.

>From [3]:

   Naxos is very slow and memory-hungry. Stylesheets larger than
   toy-sized will probably fail to run even if you specify a large
   heap for the JVM with -Xmx.

Regards,


Tony Graham                                   tgraham@xxxxxxxxxx
Consultant                                 http://www.mentea.net
Mentea       13 Kelly's Bay Beach, Skerries, Co. Dublin, Ireland
 --  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --
    XML, XSL-FO and XSLT consulting, training and programming

[1] http://osdcpapers.cgpublisher.com/product/pub.84/prod.40
[2]
http://www.biglist.com/lists/lists.mulberrytech.com/xsl-list/archives/200701/msg00553.html

[3] http://futzle.com/users/debbiep/naxos/naxos.html


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