resolveQName
Resolve a QName string to a full qualified name with namespace URI. See Chapter 22.
qname(required): qualified name (e.g."ns:Element")namespaces(required): namespace map object
utlx
resolveQName("soap:Envelope", {"soap": "http://schemas.xmlsoap.org/soap/envelope/"})
// {"localName": "Envelope",
// "namespaceUri": "http://schemas.xmlsoap.org/soap/envelope/",
// "prefix": "soap"}