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spec: Work is in progress to model the Damped Detuned Structure ( DDS ) which incorporates damping by coupling each cell to external waveguides . University Advancement also works closely with the volunteer members of the Brock University Alumni Association , representing the collective interests of Brock 's graduates . The WFTU is composed of associated and affiliated trade unions representing the collective interests of workers from countries worldwide . `` '' DITA goes beyond standard entity reuse to allow reused content to exist in a valid XML file with a DTD .