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SOAP is Not Enough
SOAP alone can provide only the function invocation service
SOAP alone is very limited
Need facility that
- Describes which services are available at a particular provider
- How to invoke them
- Enter WSDL…
Notes:
SOAP is the most fundamental piece to building Web Services but SOAP alone can provide only the function invocation service. It is possible to create a Web Service with SOAP alone, but it would be very limited and not very flexible. What we need next is some facility that describes which services are available at a particular provider and how to invoke them, that is, its interface.
This is where WSDL comes in!