Macro html5ever::namespace_url

macro_rules! namespace_url {
    ( "" ) => { ... };
    (
"http://www.w3.org/1998/Math/MathML" ) => { ... };
    ( "http://www.w3.org/1999/xlink" ) => { ... };
    ( "http://www.w3.org/2000/svg" ) => { ... };
    ( "http://www.w3.org/1999/xhtml" ) => { ... };
    ( "*" ) => { ... };
    ( "http://www.w3.org/XML/1998/namespace" ) => { ... };
    ( "http://www.w3.org/2000/xmlns/" ) => { ... };
}