When we enter the world of Service Oriented Architecture we come across various acronyms viz. XML, SOA, ESB, BPEL, WSDL, XSLT, SOAP, XSD, DTD etc. Let’s define each of them.
XML is the eXtensible Markup Language accepted by the industry as ideal vehicle for sharing structured data among applications and organizations. XML is becoming universally understood, many applications provide inputs and outputs in XML. XML makes data self describing. XML eliminates fixed formats.
XSD (XML Schema Definition), a Recommendation of the World Wide Web Consortium (W3C), specifies how to formally describe the elements in an Extensible Markup Language (XML) document.
DTD is Document Type Definition which is again one of the industry accepted way of defining XML structure.
WSDL (Web Service Definition Language) 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. Related concrete endpoints are combined into abstract endpoints (services).
SOAP (Simple Object Access Protocol) a message-based protocol based on XML for accessing services on the Web.
SOA A service-oriented architecture is essentially a collection of services. These services communicate with each other. The communication can involve either simple data passing or it could involve two or more services coordinating some activity. Some means of connecting services to each other is needed.
ESB is an open standards-based distributed synchronous or asynchronous messaging middleware that provides secure interoperability between enterprise applications via XML, Web services interfaces and standardized rules-based routing of documents.
BPEL (Business Process Execution Language) for Web services is an XML-based language designed to enable task-sharing for a distributed computing or grid computing environment - even across multiple organizations - using a combination of Web services.
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