In the process of resource retrieval, the user offers the retrieval request based on meta-data to system, retrieval operation is achieved in a unified organization view, that is to say, the system decomposes the task into a set of mesh
nodes to carry out in accordance with the organizational view automatically, this process is realized by the service
aggregation middleware between the resource retrieval agent and grid middleware layer. Grid nodes which implement the search task initiate a matching process, and these search results can be gathered by the service aggregation middleware and then return to the grid nodes that submit the searching requests.