Effect of DTD declaration on XSL processing?

Simon Brooke

Test Test HTML file

Test file to observe effect of DTD declaration on XSL processing.

Jul 20 '05 #1

Subscribe Post Reply

2116

Dean Tiegs

Simon Brooke <si***@jasmine.org.uk> writes:

(i) explain this behaviour and the reasons for it, and
Namespaces. In your XHTML with DTD, the html element and all its
descendents are in a namespace because of fixed-value attribute
declarations in the DTD. In the XHTML without DTD, the elements are
in no namespace.

In your XSLT, <xsl:template match="html"> matches only html elements
in no namespace.
(ii) suggest a recipe for XSLT stylesheets which work irrespective
of whether the DTD declaration is present or not?

I think the only way is change all your XPath expressions to match
against both possibilities. For example

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0"
xmlns:ht="http://www.w3.org/1999/xhtml">
<xsl:template match="html | ht:html">
or
<xsl:template match="*[local-name() = 'html']">

--
Dean Tiegs, NEÂ¼-20-52-25-W4
â€œConfortare et esto robustusâ€
http://telusplanet.net/public/dctiegs/

Jul 20 '05 #2

Simon Brooke

Dean Tiegs <da*******@telus.net> writes:

Simon Brooke <si***@jasmine.org.uk> writes:
(i) explain this behaviour and the reasons for it, and
Namespaces. In your XHTML with DTD, the html element and all its
descendents are in a namespace because of fixed-value attribute
declarations in the DTD. In the XHTML without DTD, the elements are
in no namespace.

Many thanks for that, that's clear and straightforward...
In your XSLT, <xsl:template match="html"> matches only html elements
in no namespace.
(ii) suggest a recipe for XSLT stylesheets which work irrespective
of whether the DTD declaration is present or not?

I think the only way is change all your XPath expressions to match
against both possibilities. For example

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0"
xmlns:ht="http://www.w3.org/1999/xhtml">
<xsl:template match="html | ht:html">

OK, this works. The effect on performance is quite surprising:

-[simon]-> time xsltproc test.xsl with-dtd.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">


real 0m11.328s
user 0m0.020s
sys 0m0.020s

-[simon]-> time xsltproc test.xsl without-dtd.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">


real 0m0.005s
user 0m0.000s
sys 0m0.000s

Presumably the extra time is taken fetching and parsing the DTD. I
*hate* generating code which isn't valid, but I'm going to have to
make a choice here between valid code and reasonable performance!

--
si***@jasmine.org.uk (Simon Brooke) http://www.jasmine.org.uk/~simon/

;; my other religion is Emacs

Jul 20 '05 #3

Richard Tobin

In article <87************@gododdin.internal.jasmine.org.uk >,
Simon Brooke <si***@jasmine.org.uk> wrote:

real 0m11.328s
user 0m0.020s
sys 0m0.020s real 0m0.005s
user 0m0.000s
sys 0m0.000s Presumably the extra time is taken fetching and parsing the DTD.

Fetching, since the cpu time is still only .04 seconds.

Can't you use a catalog to get a local copy instead? Or failing that
an http proxy?

-- Richard
--
Spam filter: to mail me from a .com/.net site, put my surname in the headers.

FreeBSD rules!

Jul 20 '05 #4

Johannes Koch

Simon Brooke wrote:

I thought I knew this stuff. I've been teaching XML since 1998. But
I've just stumbled on something which is so bizarre (to me) that I'm
beginning to think I don't understand anything at all.

Consider the attached files. They comprise one very simple XSL
transform, one copy of a very simple valid XHTML file with the DTD
declaration (without which it would not be valid), and one copy of the
same XHTML file but with the DTD declaration removed. Note that
with-dtd.html has been tested against the W3C validator.

According to the spezification you have no XHTML-Dokument
<http://www.w3.org/TR/xhtml1/#strict>:

3.
The root element of the document must contain an xmlns declaration for
the XHTML namespace [XMLNS]. The namespace for XHTML is defined to be
http://www.w3.org/1999/xhtml. An example root element might look like:

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
--
Johannes Koch
In te domine speravi; non confundar in aeternum.
(Te Deum, 4th cent.)

Jul 20 '05 #5

Simon Brooke

ri*****@cogsci.ed.ac.uk (Richard Tobin) writes:

In article <87************@gododdin.internal.jasmine.org.uk >,
Simon Brooke <si***@jasmine.org.uk> wrote:
real 0m11.328s
user 0m0.020s
sys 0m0.020s

real 0m0.005s
user 0m0.000s
sys 0m0.000s

Presumably the extra time is taken fetching and parsing the DTD.

Fetching, since the cpu time is still only .04 seconds.

Can't you use a catalog to get a local copy instead? Or failing that
an http proxy?

Not reliably, in all the places this software runs. However, it turns
out not to matter very much because in the real application the time
hit occurs only the first time the DTD declaration is seen, and as
this software tends to have uptimes of more than six months a ten
second hit at startup time is not that painful. I'm just glad that I
now understand what's going on!

The only thing that bothers me is what happens if the software doesn't
have access to the public internet at all and consequently can't fetch
the DTD. Presumably it will barf horribly and I'll have to do
something about that.

The easiest thing, of course, would be to not generate the DTD
declaration in the first place, but for purely aesthetic reasons I
don't want to do that!

--
si***@jasmine.org.uk (Simon Brooke) http://www.jasmine.org.uk/~simon/

;; my other religion is Emacs

Jul 20 '05 #6

by: Jan Nordgreen | last post by:

In my main.php I have this doc declaration at the top: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> Later in main.php I use...

PHP

XML-Stylesheet declaration in DTD causing issues

by: Sarah Haskins | last post by:

I have a few questions about this problem I'm having involving XML, DTD, and XSL. I'm working with this DTD which defines a stylesheet, as such... <?xml version="1.0" encoding="UTF-8"?>...

.NET Framework

XPath data model and the XML Declaration

by: Helmut Dirtinger | last post by:

Hi Compontents of an xml file are mapped to the different node types of the xpath data model. An element is mapped to an element node, an attribute node represents an attribute and its value...

.NET Framework

HOWTO Overcome missing namespace declaration in root node

by: David B. Bitton | last post by:

I am having a problem deserializing XML when the root node is missing a namespace declaration. My Type has an XmlTypeAttribute with a namespace defined. If I attempt to deserialize the XML, I get...

.NET Framework

Can't get a declaration

by: George1776 | last post by:

Background: I have taken an excel spreadsheet with the formatting I want, saved it as XML, then converted it to an XSL document to use it as a sort of template. Added some for-each select...

.NET Framework

Code Effect

by: Daniel Antonson | last post by:

What is the effect of the following code? char Ch; Ch = '7'; printf("%d\n", Ch);

C / C++

stylesheet declaration location

by: Alan Searle | last post by:

I have built several simple XML/XSL reports and so far have put the declaration of the style sheet (xsl) in the header of the XML file. e.g. <?xml version="1.0" encoding="iso-8859-1"?>...

.NET Framework

Copying xml declaration with XSLT

by: Dennis Benzinger | last post by:

How can I copy the xml declaration from one document to another document using XSLT? (Use case: I have a xml document where I just want to add a processing instruction without modifing the rest...

.NET Framework

variable declaration inside switch case label

by: subramanian100in | last post by:

Consider the following program: #include <iostream> using namespace std; int main() { int i;

C / C++

Cloud Servers without Credit Card and Email Registration: A Simpler Way to Get on the Cloud

by: CloudSolutions | last post by:

Introduction: For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...

General

Access Europe: Command bars, the Access Shortcut Tool and a simple Audit Log - Wed 3 April

by: isladogs | last post by:

The next Access Europe User Group meeting will be on Wednesday 3 Apr 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome former...

General

One-click Importing Excel Data into a*Database

by: ryjfgjl | last post by:

In our work, we often need to import Excel data into databases (such as MySQL, SQL Server, Oracle) for data analysis and processing. Usually, we use database tools like Navicat or the Excel import...

Microsoft Excel

How to turn on java script in a villaon keypad mobile phone

by: Charles Arthur | last post by:

How do i turn on java script on a villaon, callus and itel keypad mobile phone

Java

Basic Javascript concepts

by: aa123db | last post by:

Variable and constants Use var or let for variables and const fror constants. Var foo ='bar'; Let foo ='bar';const baz ='bar'; Functions function $name$ ($parameters$) { } ...

Javascript

Merging data from multiple Excel files

by: ryjfgjl | last post by:

In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...

Data Management

Navigating the Data Structures and Algorithms (DSA)

by: BarryA | last post by:

What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...

Algorithms / Advanced Math

Looking to do Android software development, any suggestions? Is flutter better?

by: nemocccc | last post by:

hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?

General

Is that possible of reading the .csv file in column wise and the column have different lengths ?

by: Sonnysonu | last post by:

This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...

C / C++

Effect of DTD declaration on XSL processing?

Similar topics