Since REL has no Web context, you need to pass some Web specific information to the REL context in a different way, influencing the way you implement: search, navigation links, and dynamic facets.
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Configuring REL
tcdl:region
Experience Optimization TCDL tag reference (REL)
Publishing non-standard technology Web site content
Configuring Experience Optimization for JSP or ASP.NET
Publishing content served through a Web service