Add xml namespace to xml_document

[nabulke]

How can I add an xml namespace declaration to my xml_document using pugixml?

I tried this, which results in a invalid xml (invalid char ":", says my validator):

xml_document doc;

auto declarationNode = doc.append_child(node_declaration);

declarationNode.append_attribute("xmlns\:xsi") = "http://www.w3.org/2001/XMLSchema-instance"

I save the xml_document to a string stream and need that xml namespace declaration included.

[zeux]

This code appends the xmlns attribute to the <?xml?> node; you should append it to the document element instead:

doc.document_element().append_attribute("xmlns:xsi") = "http://www.w3.org/2001/XMLSchema-instance";

[nabulke]

Thanks for your reply.
I added the code as you suggested. I use the following code to serialize the xml_document to a string:

std::string Serialize(const xml_document& doc)
{
std::stringstream ss;
doc.save(ss, "", format_raw, encoding_auto);
return ss.str();
}

Unfortunately the xml namespace declaration does not appear in the serialized string.

<?xml version="1.0" encoding="ISO-8859-1"?><rootnode xsi:type="result" version="1">....

Any idea what is still missing?

[zeux]

The code I noted adds the attribute to “rootnode” element and as such must be ran after you add rootnode to the document.

[nabulke]

I changed my code and as per your suggestion, and now it works perfectly.

Thanks a lot for your help, I appreciate it.

[nabulke]

I quoted your answer over in stackoverflow.com, where I asked a similar question. Hope that is ok for you.