19. The system of claim 18 , wherein the one or more computers comprise a server configured to interact with the user interface device through a data communication network, and the user interface device comprises an access device configured to interact with the server as a client.
18. A system comprising: a user interface device; and one or more computers comprising at least one processor and at least one memory configured to interact with the user interface device and to perform operations comprising: receiving a definition of a perspective into a dataset associated with N separate ontologies that each specify relationships among data elements in the dataset, wherein N is greater than two, the N separate ontologies correspond to an N dimensional information space, and the data elements are placed in the N dimensional information space according to semantic similarity among ontology elements, wherein the number N of dimensions in the information space matches up with the number N of the separate ontologies; reducing the N dimensional information space to X dimensions based on the perspective definition, wherein X is greater than one and less than N, the perspective comprises a projection from the N-dimensional space to the X-dimensional space, and the perspective definition defines a mapping from original N axes to target X axes, the perspective definition being denotable as P N→3 =(F 1 (DS 1 ), F 2 (DS 2 ), F 3 (DS 3 )), where P N→3 represents a perspective that maps information from N-dimensional space to 3-D space, F i represents mapping functions from original N-dimensional axes to a target i-th axis, and DS i represents original axes that participate in a transformation; and presenting a visual representation of the dataset in the X dimensional space.