We study behavioural equivalences for dynamic web data in Xdπ, a model for reasoning about behaviour found in (for example) dynamic web page programming, applet interaction, and web-service orchestration. Xdπ is based on an idealised model of semistructured data, and an extension of the π-calculus with locations and operations for interacting with data. The equivalences are non-standard due to the integration of data and processes, and the presence of locations.
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