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Resource brokers on the grid consult a number of distributed information services to select the best data source and/or computational resource based on user requirements. The consultation task increases the design complexity of Resource Brokers. This work is the first attempt to unify the distributed grid information services in one framework. The grid query service (GQS) is composed of information services layered on OGSA-DAI grid services, which are generic data access and integration services. Grid resource brokers can consult just one service, the GQS service, to obtain indexed information about grid resources.