Macro html5ever::namespace_prefix

macro_rules! namespace_prefix {
    ( "mathml" ) => { ... };
    (
"xmlns" ) => { ... };
    ( "html" ) => { ... };
    ( "xml" ) => { ... };
    ( "xlink" ) => { ... };
    ( "*" ) => { ... };
    ( "svg" ) => { ... };
    ( "" ) => { ... };
}

Takes a namespace prefix string and returns its key in a string cache.