EPA Service Oriented Architecture Objectives and Benefits The objective of EPA’s Service Oriented Architecture (SOA) is to provide a more productive, standards based approach for delivering cost effective business functions. This IT design framework is agile and flexible. SOA decreases costs and simplifies operations and maintenance by building shared services that are truly aligned with business requirements. SOA Basics What SOA components are currently available? A service-oriented architecture is a collection of standards based Universal Description, Discovery, and Integration (UDDI) – A Web services that use a common messaging technology model. standard, interoperable platform that enables organizations and The communication can involve either simple data passing or it applications to quickly, easily, and dynamically find and use Web could involve two or more services coordinating an activity. SOA services over the Internet involves three basic players: a service provider, a service consumer, Network Authentication and Authorization Server (NAAS) – and a service broker. Some means of connecting services to each Security services for authentication and authorization of web other is needed. services Web services are a key messaging component for EPA’s SOA Quality Assurance – Services for validating XML documents Web services are the connection technology of EPA’s service- oriented architecture. Web services use eXtensible Markup Web Service Specifications – Design standards for ensuring Web Language (XML) to create this robust connection. EPA’s Central service interoperability Data Exchange (CDX) uses a combination of technologies for Web service application and management to support the Agency’s XML Gateway – Web service message filtering and XML SOA. acceleration services (coming soon) Join the Agency’s Web services Working group! How do Web services work? Shared Web services provided by CDX: Web services are based on a universal programming model that Network Security Services facilitates the sharing of functionality and information via the Authenticate – Users (or computers) authenticate with the NAAS Internet, regardless of operating system, hardware or delivery to obtain Security Tokens to access services on the Network, device, programming language, database or other back-end including data exchanges. system. Web services provide EPA programmatic services across the Internet and make it easier to work both across and within Authorization – A determination of whether the service requestor organizations. is entitled to perform the operation, which can range from invoking the Web service to executing a specific part of its functionality. How can Web services assist your program’s needs? Web services are information sources and application components Database Services whose functionality and interfaces are exposed to consumers Query – A database query that provides results to the requestor using emerging Web technology standards. In contrast to Web in XML format. sites, Web services are offered computer-to-computer, via defined Solicit – A query performed against a database on the network formats and protocols and are capable of processing large amounts that returns the result in XML format to the requestor. of data across the Internet. Examples of Web services used in the Agency include: publishing the substance registry; collecting air, Document Exchange Services water, waste, and facility data; and providing security and quality Submit / Download – One or multiple sets of data are sent/retrieved assurance for the Exchange Network. to and from the service provider. Quality Assurance Services Web Services / SOA Contacts XML documents are parsed against design schemas for testing and Connie Dwyer (firstname.lastname@example.org) production data. Chris Clark (email@example.com) Schematron – Complex business rules are evaluated in order to EPA Central Data Exchange (http://www.epa.gov/cdx) validate data. EPA Web Services (http://www.epa.gov/webservices) For information regarding the Web Services Working Group, Administration Services please contact Connie Dwyer. User account and access privileges are made available as services.
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