TokenProcessingState.lookupNamespaceUri
string lookupNamespaceUri(string prefix) const @safe nothrowLooks up a namespace URI for the given prefix.
Well-known prefixes are resolved without consulting the stack:
"xml"→"http://www.w3.org/XML/1998/namespace""xmlns"→"http://www.w3.org/2000/xmlns/"Parameters
prefixNamespace prefix. Empty string denotes the default namespace. Returns
The resolved URI, or an empty string if the prefix is undeclared.