DEFINITION: A Web Service ABB is a Application Interfase being identified by a universal resource identifier (URI), whose service description and transport utilise open Internet standards. Source: W3 (https://www.w3.org/TR/2004/NOTE-ws-arch-20040211/#relwwwrest) INTEROPERABILITY SALIENCY: IoP Dimension: Structural IoP, Behavioral IoP EXAMPLES: The following implementation is an example on how this specific Architecture Building Block (ABB) can be instantiated as a Solution Building Block (SBB): Web Services Description Language (WSDL) WSDL is an XML format for describing network services as a set of endpoints operating on messages containing either document-oriented or procedure-oriented information. The operations and messages are described abstractly, and then bound to a concrete network protocol and message format to define an endpoint Source: (https://www.w3.org/TR/wsdl.html)