What protocol is normally used for transferring data between Web services?Correct!  SOAP   XML   WSDL   UDDI

The protocol that is normally used for transferring data between Web services is SOAP (Simple Object Access Protocol).

Here's a step-by-step explanation:

1. SOAP is a messaging protocol that allows programs running on disparate operating systems to communicate with each other. It uses XML for its message format, which is widely used for representing structured data.

2. SOAP can be used to send messages over HTTP/HTTPS, making it compatible with most existing firewall rules. This is why it's commonly used for web services, which often need to send messages over the internet.

3. SOAP messages are independent of the platform, language and object model, which makes it highly versatile for web services.

4. While XML, WSDL, and UDDI are all related to web services, they serve different purposes. XML is a markup language used for encoding documents in a format that is both human-readable and machine-readable. WSDL (Web Services Description Language) is an XML-based interface definition language that is used for describing the functionality offered by a web service. UDDI (Universal Description, Discovery, and Integration) is a platform-independent, XML-based registry for businesses worldwide to list themselves on the internet.

So, in summary, SOAP is the protocol typically used for transferring data between web services.