We present DXQ, an extension of XQuery to support the effective and efficient development of distributed XML applications. A DXQ program can invoke remote DXQ programs both synchronously and asynchronously and can dynamically ship DXQ code to execute at remote servers. We illustrate the power of the language with two distributed applications: the resolution algorithm of the Domain Name System (DNS) and the Narada overlay-network protocol. Our implementation permits concurrent evaluation of DXQ expressions at each server and can produce results extensionally (as XML values) or intensionally (as DXQ expressions). 1
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