Message Description Component

Similarly, in the world of bits WSDL allows for a WSDL document to specify the various messages which a service can input or output. This is done in the Message Description Component of a WSDL document. Just as your foreign colleagues can make a list of messages which they can input or output, the Message Description Component of a WSDL document indicates the various messages which a service can input or output. To give a flavor of what this looks like in practice lets take a peek at a WSDL document snippet:

<message name="GetLastTradePriceInput">
  <part name="body" element="xsd1:TradePriceRequest"/>
</message>

<message name="GetLastTradePriceOutput">
  <part name="body" element="xsd1:TradePrice"/>
</message>

This snippet defines two messages. The first message GetLastTradePriceInput contains a single part which contains a TradePriceRequest, a type which we defined above. The second message GetLastTradePriceOutput contains a single part which contains a TradePrice, a type we also defined above. So, you can begin to see how this process snowballs.