Web Services Description Language (WSDL)
Universal Description, Discovery, and Integration
Computer programs are brittle. It is easier for applications to talk to people than to other applications. That’s why Web services specifications are less mature than pure Web specifications.
There are three major Web services technologies: SOAP, WSDL, and UDDI. We covered SOAP in Chapter 19, “Web services introduction”, on page 414. Now we’ll take a closer look at the other two.
If I agree to provide you with some XML documents, we will also agree on the document type. That agreement is usually recorded formally in a DTD or schema definition. The definition ...