macro_rules! namespace_url {
( "" ) => { ... };
(
"http://www.w3.org/2000/xmlns/" ) => { ... };
( "*" ) => { ... };
( "http://www.w3.org/1998/Math/MathML" ) => { ... };
( "http://www.w3.org/2000/svg" ) => { ... };
( "http://www.w3.org/XML/1998/namespace" ) => { ... };
( "http://www.w3.org/1999/xhtml" ) => { ... };
( "http://www.w3.org/1999/xlink" ) => { ... };
}
Takes a namespace url string and returns its key in a string cache.