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In one embodiment, a method includes storing one or more graphs, each graph comprising one or more nodes arranged in a hierarchical format, each node representing one or more data items; accessing a query requesting one or more specific data items in the graphs, the query being expressed in a language having a hierarchical format; retrieving the specific data items from the graphs; arranging the specific data items in a hierarchical format; and outputting the specific data items in response to the query.

Source: US9646028B2 – Graph query logic – Google Patents

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