Adding multiple namespace declarations in XmlWriter

user_108183 0
Viewed 19108

I am trying to write out the following element using XmlWriter

<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom">

I've got the very first declaration done using

writer.WriteStartElement("kml", "http://www.opengis.net/kml/2.2");

How can I add the remaining 3 declarations to the same element?

xmlwriter namespaces
3 Answers
writer.WriteAttributeString("xmlns","gx", null, "http://www.google.com/kml/ext/2.2");
writer.WriteAttributeString("xmlns","kml", null, "http://www.opengis.net/kml/2.2");
writer.WriteAttributeString("xmlns","atom", null, "http://www.w3.org/2005/Atom");

Got that from https://msdn.microsoft.com/en-us/library/cfche0ka(v=vs.100).aspx.

user_1571140

The answer of Ryan B is incomplete as the XML namespace is only written as attribute but not registered in the name table, so LookupPrefix will fail getting prefix of one of the XML namespaces, f.i. http://www.w3.org/2005/Atom. It will return null instead atom.

To write a namespace attribute and get namespace registered use

writer.WriteAttributeString("atom",
                            "http://www.w3.org/2000/xmlns/",
                            "http://www.w3.org/2005/Atom");

Use of namespace http://www.w3.org/2000/xmlns/registers also the prefix in name table.

user_17342010

The namespaces are simply attributes. Use the standards means of writing attributes for the element.

user_809060
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