1. A method for use of a medical ontology for computer assisted clinical decision support, the method comprising: providing a medical ontology indicating one or more semantic groupings of features; learning, by a processor, to identify at least one similar patient record from a set of patient records, the learning being a function of the one or more semantic groupings of features of the medical ontology; and outputting information derived from the learning.
2. The method of claim 1 wherein learning comprises integrating a graph structure of the medical ontology, the one or more semantic groupings of features corresponding to one or more respective branches of the graph structure.