8. A system for generating data describing concepts from data describing schema, comprising: a processor capable of being configured using machine readable instructions; a tangible machine readable medium, operatively coupled to the processor, and on which is stored instructions for configuring the processor, the instructions for causing the processor to perform a method comprising: accepting data describing a plurality of schema; deriving a respective graph representation of each schema in the plurality of schema to form data describing a set of graphs; mining the set of graphs to determine a set of closed subgraphs that appear in the set of graphs with a specified minimum support, wherein the mining of the set of graphs comprises initially identifying a pattern occurring in multiple graphs of the set of graphs and repeatedly enlarging the pattern by adding edges found in to the pattern to make the pattern larger until a number of graphs in the plurality of graphs that would remain after adding another component to the pattern falls below a threshold; converting at least some of the subgraphs to respective schema representations; and storing data representing the schemas created from the converted subgraphs.
8. A system for generating data describing concepts from data describing schema, comprising: a processor capable of being configured using machine readable instructions; a tangible machine readable medium, operatively coupled to the processor, and on which is stored instructions for configuring the processor, the instructions for causing the processor to perform a method comprising: accepting data describing a plurality of schema; deriving a respective graph representation of each schema in the plurality of schema to form data describing a set of graphs; mining the set of graphs to determine a set of closed subgraphs that appear in the set of graphs with a specified minimum support, wherein the mining of the set of graphs comprises initially identifying a pattern occurring in multiple graphs of the set of graphs and repeatedly enlarging the pattern by adding edges found in to the pattern to make the pattern larger until a number of graphs in the plurality of graphs that would remain after adding another component to the pattern falls below a threshold; converting at least some of the subgraphs to respective schema representations; and storing data representing the schemas created from the converted subgraphs. 10. The system for generating data describing concepts from data describing schema of claim 8 , wherein the deriving of the respective graph representations further comprises determining a respective type and a respective similarity class for each vertice of the graph representations, and using the type and similarity class during mining of the set of graphs.