信封在此肥皂请求中引用了什么？
OST /InStock HTTP/1.1 Host: www.example.org Content-Type: application/soap+xml; charset=utf-8 Content-Length: nnn
<?xml version="1.0"?> <soap:Envelope xmlns:soap="http://www.w3.org/2001/12/soap-envelope" soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">
<soap:Body xmlns:m="http://www.example.org/stock"> <m:GetStockPrice>
<m:StockName>IBM</m:StockName> </m:GetStockPrice> </soap:Body>
</soap:Envelope>