Answer:
There are three technologies used for implementing the SOA most commonly with Web services are UDDI (Universal Description, Discovery & Integration) , WSDL (Web Services Description Language) and SOAP (Simple Object Access Protocol) .
Out of them XML technologies are Web Services Description Language (WSDL) and Simple Object Access Protocol (SOAP).
WSDL is an XML language that describes a Web service.
SOAP is an XML Protocol and it is used by client application to communicate with web services.