In this example, a GetLastTradePrice SOAP request is sent to a StockQuote service. The request takes a string parameter, ticker symbol, and returns a float in the SOAP response. The SOAP Envelope element is the top element of the XML document representing the SOAP message. XML namespaces are used to disambiguate SOAP identifiers from application specific identifiers. The example illustrates the HTTP bindings defined in section 6. It is worth noting that the rules governing XML payload format in SOAP are entirely independent of the fact that the payload is carried in HTTP.