Hi, 2 questions....
1. I'm parsing an XHTML document that contains both the default namespace
(xmlns="http://www.w3.org/1999/xhtml") and a custom one (xmlns:r="...") -
both of these being attributes of <html>. When I then insert new XmlNodes
into the DOM the HTML tags all end up getting an unnecesarry 'xmlns'
attribute added, elements with the 'r' prefix don't, which is correct. Is
there any way to stop the XmlNode/XmlWriter from inserting the unneeded
attributes to the html tags?
2. My program is reading in an XHTML file, adding/removing/changing elements
and then writing new ones back out again, when the document begins with:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
it runs very-very-very slowly, removing the DOCTYPE from the file speeds the
process up by around 1 minute! (this isn't a particularly large file, only
about 5-10 new elements are being added). This is obviously because of the
DTD (the slow down seems to be happening in
XmlDocument.CreateDocumentFragment and the XmlNode insertion methods mostly,
is there any way to turn off the DTD verification? It's so slow it looks like
it's downloading the url each time!
I'm running .net 1.1 on a very fast machine btw.
Thanks...
david
4  4112 
David Grogan wrote: 1. I'm parsing an XHTML document that contains both the default namespace
(xmlns="http://www.w3.org/1999/xhtml") and a custom one (xmlns:r="...") -
both of these being attributes of <html>. When I then insert new XmlNodes
into the DOM the HTML tags all end up getting an unnecesarry 'xmlns'
attribute added, elements with the 'r' prefix don't, which is correct. Is
there any way to stop the XmlNode/XmlWriter from inserting the unneeded
attributes to the html tags?
Make sure you use the proper namespace URI when you create new XHTML
elements e.g.
XmlElement paragraph = xmlDocumentInstance.CreateElement("", "p",
"http://www.w3.org/1999/xhtml");
That way I do not have problems with additional xmlns attributes e.g.
complete example
const string xhtml1NamespaceURI = "http://www.w3.org/1999/xhtml";
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.LoadXml(@"<html xmlns=""http://www.w3.org/1999/xhtml"">
<head>
<title>Example</title>
</head>
<body>
<h1>Example</h1>
</body>
</html>");
xmlDocument.Save(Console.Out);
XmlElement paragraph = xmlDocument.CreateElement("", "p",
xhtml1NamespaceURI);
paragraph.AppendChild(xmlDocument.CreateTextNode(" Kibology for
all."));
XmlElement body = xmlDocument.GetElementsByTagName("body",
xhtml1NamespaceURI)[0] as XmlElement;
if (body != null) {
body.AppendChild(paragraph);
xmlDocument.Save(Console.Out);
}
outputs
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Example</title>
</head>
<body>
<h1>Example</h1>
<p>Kibology for all.</p>
</body>
</html>
2. My program is reading in an XHTML file, adding/removing/changing elements
and then writing new ones back out again, when the document begins with:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
it runs very-very-very slowly, removing the DOCTYPE from the file speeds the
process up by around 1 minute!
You can set the XmlResolver property to a resolver which loads the DTD
from a locally cached file instead of loading from www.w3.org each time.
--
Martin Honnen --- MVP XML http://JavaScript.FAQTs.com/
"Martin Honnen" wrote: Make sure you use the proper namespace URI when you create new XHTML
elements e.g.
XmlElement paragraph = xmlDocumentInstance.CreateElement("", "p",
"http://www.w3.org/1999/xhtml");
I'm not using XmlDocument.CreateElement, here's a more detailed example...
input xml:
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:r="urn:test">
<head><title></title></head>
<body>
<br /><b>Heading</b><p>Hello</p><br />
</body>
</html>
If 'node' is the XmlNode for <body> then the following code is where my
problem lies...
Dim innerXml As String = node.InnerXml
looking at innerXml while debugging I see that it looks like...
<br xmlns="http://www.w3.org/1999/xhtml"/><b
xmlns="http://www.w3.org/1999/xhtml">Heading</b><p
xmlns="http://www.w3.org/1999/xhtml">Hello</p><br
xmlns="http://www.w3.org/1999/xhtml"/>
then I'm inserting various bits and pieces into innerXml followed by...
Dim newNode As XmlNode = node.OwnerDocument.CreateDocumentFragment
newNode.InnerXml = newInnerXml
node.ParentNode.ReplaceChild(newNode, node)
CreateDocumentFragment doesn't have a parameter for setting the namespace,
and newNode's NamespaceURI property is ReadOnly...
You can set the XmlResolver property to a resolver which loads the DTD
from a locally cached file instead of loading from www.w3.org each time.
setting the XmlResolver to Nothing fixed this, thanks.
David
David Grogan wrote: input xml:
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:r="urn:test">
<head><title></title></head>
<body>
<br /><b>Heading</b><p>Hello</p><br />
</body>
</html>
If 'node' is the XmlNode for <body> then the following code is where my
problem lies...
Dim innerXml As String = node.InnerXml
looking at innerXml while debugging I see that it looks like...
<br xmlns="http://www.w3.org/1999/xhtml"/><b
xmlns="http://www.w3.org/1999/xhtml">Heading</b><p
xmlns="http://www.w3.org/1999/xhtml">Hello</p><br
xmlns="http://www.w3.org/1999/xhtml"/>
It has to look like that, all those elements are in the XHTML namespace
with namespace URI http://www.w3.org/1999/xhtml and if they are
serialized alone then the xmlns="http://www.w3.org/1999/xhtml" has to be
added to serialize them properly. Only if there is a parent or ancestor
element which already declares xmlns="http://www.w3.org/1999/xhtml" then
the child or descendant elements do not need the declaration of the
namespace.
--
Martin Honnen --- MVP XML http://JavaScript.FAQTs.com/
"Martin Honnen" wrote: looking at innerXml while debugging I see that it looks like...
<br xmlns="http://www.w3.org/1999/xhtml"/><b
xmlns="http://www.w3.org/1999/xhtml">Heading</b><p
xmlns="http://www.w3.org/1999/xhtml">Hello</p><br
xmlns="http://www.w3.org/1999/xhtml"/>
It has to look like that, all those elements are in the XHTML namespace
with namespace URI http://www.w3.org/1999/xhtml and if they are
serialized alone then the xmlns="http://www.w3.org/1999/xhtml" has to be
added to serialize them properly. Only if there is a parent or ancestor
element which already declares xmlns="http://www.w3.org/1999/xhtml" then
the child or descendant elements do not need the declaration of the
namespace.
but surely when newNode is inserted as a child of <html> it should strip out
the xmlns attributes because they are superfluous? all <html>'s child nodes
without a namespace prefix should inherit it's default namespace.
is there any way to remove these xmlns attributes without using
CreateElement for each element in the InnerXml?
david This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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