Difference between an XML Schema and WSDL?

    XSD defines a schema which is a definition of how an XML document can be structured. You can use it to check that a given XML document is valid and follows the rules you've laid out in the schema.

·   WSDL is an XML document that describes a web service. It shows which operations are available and how data should be structured to send to those operations.

·   WSDL documents have an associated XSD that show what is valid to put in a WSDL document