WSDL - Features of WSDL

What is WSDL?

WSDL stands for Web Services Description Language. It's an XML-based language used to describe what a web service does, how to access it, and where to find it.

Features of WSDL

1. XML-Based Format

WSDL uses XML to define the structure of the web service. This makes it easy for both humans and machines to read and process the information.

2. Describes the Web Service Completely

A WSDL file describes:

• What operations the service provides

• What input and output data it expects

• How to access the service (protocol and endpoint)

So, it acts like a contract between the service provider and the client.

3. Platform and Language Independent

Since WSDL is written in XML, it can be used with any programming language and any platform (Java, .NET, PHP, etc.). This supports interoperability across systems.

4. Supports Multiple Bindings and Protocols

WSDL can define how the service can be accessed using different protocols like HTTP, SOAP, or even MIME. This gives flexibility in how clients interact with the service.

5. Defines Data Types (using XML Schema)

WSDL allows you to define custom data types using XSD (XML Schema Definition). This ensures the correct format of input/output data for the web service.

6. Machine Readable

Because it’s machine-readable, tools like SOAP UI, Postman, or IDEs like Eclipse and Visual Studio can automatically generate client code to interact with the service using the WSDL.

7. Separation of Concerns (Modular Design)

A WSDL document is usually divided into different sections:

• Types – defines data types

• Messages – defines input/output messages

• PortType – defines the service interface (what it can do)

• Binding – defines how the service can be accessed (protocol)

• Service – provides the actual URL/location of the service

This modular structure makes WSDL easy to understand and maintain.