A namespace with escape characters fails:

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"><s:Body><RetQName xmlns="http://tempuri.org/"><inQName xmlns="" xmlns:a=">:Can We do it<:">a:localname</inQName></RetQName></s:Body></s:Envelope>

A value with escape characters fails:

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"><s:Body><RetQName xmlns="http://tempuri.org/"><inQName xmlns="" xmlns:a="namespace">a:<::Yes We Can ::></inQName></RetQName></s:Body></s:Envelope>