WSDL #

The Web Services Description Language describes web services and how to access them. WSDL descriptions are written in XML.

WADL  #

The Web Application Description Language is designed to provide a machine processable description  HTTP-based Web applications.

SOAP  #

The XML-based Simple Object Access protocol offers the capabilites for exchanging structured information between web services.

UDDI #

The XML-based Universal Description, Discovery and Integration specification defines a universal method for enterprises to dynamically discover and invoke Web services

REST #

The Representational State Transfer an architecture style for designing networked applications in a simpler way than common standards like for example SOAP.