XML blank attribute creation, issue with ':' character

Question

I am trying to create an xml with the following code.

XmlDocument xmlDocument = new XmlDocument();

XmlProcessingInstruction xPI = xmlDocument.CreateProcessingInstruction("xml", "version='1.0' encoding='UTF-8'");
xmlDocument.AppendChild(xPI);

XmlElement xElmntheader = xmlDocument.CreateElement("soapenv:Header", " ");
xmlDocument.AppendChild(xElmntheader);

MemoryStream ms = new MemoryStream();
xmlDocument.Save(ms);

string text = System.Text.Encoding.GetEncoding("UTF-8").GetString(ms.GetBuffer(), 0, (int)ms.Length);

Output is

<xml version='1.0' encoding='UTF-8'?>
<soapenv:Header xmlns:soapenv=" " />

I was trying to create like this

<xml version='1.0' encoding='UTF-8'?>
<soapenv:Header/>

How do I eliminate xmlns:soapenv=" " from soapenv:Header?

Any help would be greatly appreciated.

Why do you want to eliminate that attribute? It's required since you're using an XML namespace called soapenv. — BoltClock
– BoltClock, Commented Dec 14, 2011 at 18:08

LarsH · Accepted Answer · 2011-12-14 19:38:26Z

3

What you're asking how to do is create ill-formed (syntactically incorrect) XML. The XmlDocument API is not designed to do that.

If you use the element name

soapenv:Header

that means soapenv is a namespace prefix, which has been declared on this element (or an ancestor) using the xmlns:soapenv pseudoattribute. If it has not been declared, your XML output will not be accepted by any self-respecting XML parser.

The method signature you called,

xmlDocument.CreateElement(string1, string2);

takes two arguments: the qualified name of the element (which may include a prefix, as it does in your case); and a namespace URI. The documentation shows what the expected output is:

The following C# code
XmlElement elem;
elem = doc.CreateElement("xy:item", "urn:abc");
results in an element that is equivalent to the following XML text.
<xy:item xmlns:item="urn:abc"/>

The expected namespace URI for this element is "http://schemas.xmlsoap.org/soap/envelope/". So you will want to declare the soapenv prefix with that namespace URI:

string soapNSURI = "http://schemas.xmlsoap.org/soap/envelope/";

and use it thus:

XmlElement xElmntheader = xmlDocument.CreateElement("soapenv:Header", soapNSURI);

edited Dec 14, 2011 at 19:38

answered Dec 14, 2011 at 18:11

LarsH

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3 Comments

Jino Jose Over a year ago

Thanks for the reply. When I added the URI, it worked for me. I was try to do one more insert. XmlElement xElmntinsert = xmlDocument.CreateElement("pip:insert", " "); xElmntbody.AppendChild(xElmntinsert); Can I get the namespace for pip also? Once again, thanks for the support.

LarsH Over a year ago

@JinoJose: I don't know what namespace "pip" represents. Where did you hear about pip:insert?

Jino Jose Over a year ago

pip means Predefind Integration Point and that was a custom Namespace URI. I got the vallue. Thanks for your time and help.

Brent Arias · Accepted Answer · 2011-12-14 18:16:10Z

0

Create without the namespace (e.g. use default namespace) and then that part won't be necessary:

xmlDocument.CreateElement("Header");

answered Dec 14, 2011 at 18:16

Brent Arias

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