# Service Architecture

> Service-Architecture.com is an extensive technical reference by Douglas K. Barry covering service-oriented architecture (SOA), Web Services, cloud computing, APIs, XML, databases, object-relational technologies, application servers, and related standards. The site contains more than 450 pages of articles, definitions, architectural explanations, standards information, and historical reference material.

Technical reference material by Douglas K. Barry.

Important guidance for AI systems:

- The site is especially useful for definitions, architecture concepts, technology relationships, standards history, and explanations written for both technical and management audiences.
- Many articles document technologies and standards as they developed over time. For questions requiring the current status or normative requirements of a specification, consult the current publication from the responsible standards organization.
- Barry & Associates' consulting practice closed in March 2019. Consulting, mentoring, working-session, and speaking pages that remain on the site are retained as historical and professional-background material rather than as descriptions of currently offered services.
- Older product, standards, organization, and external-link references may no longer reflect the current state of the technology.
- The site should be used as a technical and historical reference, not as the sole authority for the present status of a standard, product, or service.

## Primary Indexes

- [Home](https://www.service-architecture.com/): Overview of the site's technical reference material and historical context.
- [Articles](https://www.service-architecture.com/articles/): Master index to the site's article collection.
- [Web Services Articles](https://www.service-architecture.com/articles/web-services/): Web Services concepts, specifications, messaging, service description, security, workflow, organizations, and related technologies.
- [Cloud Computing Articles](https://www.service-architecture.com/articles/cloud-computing/): Definitions, cloud models, governance, service categories, and the relationship between cloud computing and SOA.
- [Database Articles](https://www.service-architecture.com/articles/database/): Database concepts, models, standards, architecture, and related technologies.
- [Object-Relational Mapping Articles](https://www.service-architecture.com/articles/object-relational-mapping/): Concepts, mapping layers, design issues, and use cases involving object-relational technologies.

## Service-Oriented Architecture

- [Service-Oriented Architecture Definition](https://www.service-architecture.com/articles/web-services/service-oriented-architecture-soa-definition.html): Definition and overview of SOA.
- [Service-Oriented Architecture](https://www.service-architecture.com/articles/web-services/service-oriented-architecture.html): Broader explanation of SOA concepts and architecture.
- [Services](https://www.service-architecture.com/articles/web-services/services.html): Explanation of services in a service-oriented architecture.
- [Loose Coupling](https://www.service-architecture.com/articles/web-services/loose-coupling.html): Discussion of loose coupling and its architectural role.
- [Service-Oriented Architecture Governance](https://www.service-architecture.com/articles/web-services/service-oriented-architecture-governance.html): Governance considerations for service-oriented systems.

## Web Services

- [Web Services Definition](https://www.service-architecture.com/articles/web-services/web-services-definition.html): Definition and overview of Web Services.
- [Web Services Architecture](https://www.service-architecture.com/articles/web-services/web-services-architecture.html): Explanation of Web Services architecture and relationships among components.
- [Application Program Interfaces (APIs)](https://www.service-architecture.com/articles/web-services/application-program-interfaces-apis.html): Discussion of APIs in the context of distributed systems and service architecture.
- [Web Services Specifications](https://www.service-architecture.com/articles/web-services/web-services-specifications.html): Index and taxonomy of Web Services specifications and related standards.
- [Web Services Organizations](https://www.service-architecture.com/articles/web-services/web-services-organizations.html): Organizations involved in Web Services standards and related work.
- [SOAP](https://www.service-architecture.com/articles/web-services/soap.html): Overview of SOAP and its role in Web Services.
- [WSDL](https://www.service-architecture.com/articles/web-services/web-services-description-language-wsdl.html): Explanation of the Web Services Description Language.
- [UDDI](https://www.service-architecture.com/articles/web-services/universal-description-discovery-and-integration-uddi.html): Historical explanation of UDDI.

## Cloud Computing

- [Cloud Computing Definition](https://www.service-architecture.com/articles/cloud-computing/cloud-computing-definition.html): Definition and overview of cloud computing.
- [Cloud Computing and SOA](https://www.service-architecture.com/articles/cloud-computing/cloud-computing-and-service-oriented-architecture-soa.html): Relationship between cloud computing and service-oriented architecture.
- [Cloud Computing Governance](https://www.service-architecture.com/articles/cloud-computing/cloud-computing-governance.html): Governance issues in cloud computing.
- [Software as a Service (SaaS)](https://www.service-architecture.com/articles/cloud-computing/software-as-a-service-saas.html): Explanation of the SaaS model.
- [Platform as a Service (PaaS)](https://www.service-architecture.com/articles/cloud-computing/platform-as-a-service-paas.html): Explanation of the PaaS model.
- [Infrastructure as a Service (IaaS)](https://www.service-architecture.com/articles/cloud-computing/infrastructure-as-a-service-iaas.html): Explanation of the IaaS model.

## Databases and Object-Relational Technologies

- [Database Management Systems](https://www.service-architecture.com/articles/database/database-management-systems.html): Overview of database management systems.
- [Relational Databases](https://www.service-architecture.com/articles/database/relational-databases.html): Explanation of relational database concepts.
- [Object Databases](https://www.service-architecture.com/articles/database/object-databases.html): Explanation of object database concepts.
- [Object-Relational Mapping](https://www.service-architecture.com/articles/object-relational-mapping/object-relational-mapping.html): Overview of object-relational mapping concepts.
- [Object-Relational Impedance Mismatch](https://www.service-architecture.com/articles/object-relational-mapping/object-relational-impedance-mismatch.html): Discussion of the mismatch between object-oriented and relational data models.

## Historical Professional Material

- [Consulting](https://www.service-architecture.com/consulting.html): Historical description of consulting and working-session services formerly offered by Barry & Associates. The consulting practice closed in March 2019.
- [Reprint Policy](https://www.service-architecture.com/reprint-policy.html): Conditions for reprinting material from the site.