Systems and methods are described for declarative localization of web services. A "localize" attribute is described that uniquely identifies localized content for the final rendered element. The "localize" attribute is stripped out during the rendering process, so it never reaches the client or agent, making the "localize" attribute HTML-compliant. A separate satellite assembly is maintained for each culture. When a request is received, a culture is identified and the "localize" attribute directs processing to utilize content maintained in the satellite assembly associated with the identified culture. Processing then continues normally.