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Consumer-Driven Contracts

Posted by Stefan Tilkov on Jun 15, 2006 06:16 AM

Community
Architecture,
SOA
Topics
Web Services
Tags
XML Schema,
Contract First Development
The more service-oriented computing becomes mainstream, the more versioning of service contracts becomes an issue in a community of service providers and consumers. In an article published on Martin Fowler's web site, Ian Robinson describes a new strategy for evolving service contract versions. Ian starts by describing different strategies for creating backwards- and forwards-compatible schemas and discusses the usage of Schematron to reduce a consumer's dependency on a specific schema version. Buildling on this, the notion of contracts driven by consumers' needs (instead of providers' capabilities) is introduced.

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