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RE: [xsl] When are <!DOCTYPE> and svg namespace references material?

2010-02-03 12:38:26
Martin - thanks. 

I guess, based on your answers, the question would be with regard to my XSLT 
transformations using Saxon. We perform transformations to do language 
localization on labels in our SVG graphics. Apparently it is this process that 
is in question - and perhaps of interest to the list. 

I use Saxon for my transformations but we are not asking it to validate against 
the DTD, however, I'm wondering if it is trying because of the <!DOCTYPE> 
declaration. If I remove the <!DOCTYPE> declaration or point it to an invalid 
URL Saxon doesn't seem to mind. What I don't know is if the parser is "trying" 
to find the DTD, failing and then driving on. 

Perhaps my question is Saxon specific and I should post to the Saxon list.

Thanks for the info - Steve

-----Original Message-----
From: Martin Honnen [mailto:Martin(_dot_)Honnen(_at_)gmx(_dot_)de] 
Sent: Wednesday, February 03, 2010 12:05 PM
To: Ylvisaker, Steve
Subject: Re: [xsl] When are <!DOCTYPE> and svg namespace references material?

Note that your question does not relate to XSLT so I reply off list.

Ylvisaker, Steve wrote:
There is a concern that our SVG graphics implementation may be introducing 
external reference dependencies outside our local network. An example graphic 
is:

<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE svg PUBLIC 
"-//W3C//DTD SVG 1.1//EN" 
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd";>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg"; 
xmlns:xlink="http://www.w3.org/1999/xlink"; x="0px" y="0px" 
width="357.553px" height="216.893px" viewBox="0 0 357.553 216.893" 
enable-background="new 0 0 357.553 216.893" xml:space="preserve">

Our graphics are, for the most part, generated by Adobe Illustrator 
CS3 but we are running xslt transformations against them with Saxon 
and viewing the graphics with a variety of tools: Firefox, InkScape, 
Ai CS3, Antenna House formatter and Saxon-PE 9.2.0.2

I have isolated my work station (no corporate network or internet) and all of 
these applications work fine. But I don't know if they are trying to make an 
external reference, failing and driving on, or if the <!DOCTYPE> and W3 name 
space references are little more than documentation. Three of the 
applications, Firefox, InkScape and Adobe CS3 care about the name of the 
xmlns URL. Something other than www.w3.org trips them up. Antenna House and 
Saxon don't seem to care. With the <!DOCTYPE> declaration I can reference 
www.w3.org as above, or reference an internal network URL or drop the 
declaration all together and none of the applications perform differently. 
All of this is, of course, anecdotal data at best. It would be great to know 
for sure what is going on.

My question: Is there ever an attempt to make an external reference to 
www.w3.org from either the <!DOCTYPE> declaration or the xmlns reference?

An XML parser could try to read the DTD referenced in the DOCTYPE, in 
particular if it wants to validate the XML document.

As for the namespaces like
   xmlns="http://www.w3.org/2000/svg"; 
xmlns:xlink="http://www.w3.org/1999/xlink";
no, these do not result in any network access but they matter to any tool you 
want to render the SVG with as the renderer knows how to render e.g. a 'circle' 
element in the SVG namespace 'http://www.w3.org/2000/svg' but does not know how 
to render a 'circle' 
element in no namespace or a different namespace.

-- 

        Martin Honnen
        http://msmvps.com/blogs/martin_honnen/


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