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

Subject: [xsl] When are <!DOCTYPE> and svg namespace references material?
From: "Ylvisaker, Steve" <steve.j.ylvisaker@xxxxxxxxxxxxx>
Date: Wed, 3 Feb 2010 11:57:36 -0600
There is a concern that our SVG graphics implementation may be introducing
external reference dependencies outside our local network. An example graphic

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
<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

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?

Thanks in advance for this clarification



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