XmlStreamWriter.startElementNS

void startElementNS(string namespaceUri, string local, string prefix = "") @safe

Starts an element using a namespace URI and local name.

`namespaceUri`	Namespace URI (empty means no namespace).
`local`	Local name.
`prefix`	Optional prefix. If `namespaceUri` is non-empty and `prefix` is empty, the default namespace is used.