According to an aspect, conceptual analysis of a document includes accessing a concept graph that includes a plurality of nodes and edges. Each node represents a concept and each edge represents a known relation between two concepts. Conceptual analysis of the document further includes computing a relevance of the document to concepts in the concept graph. The computing includes receiving a priori information about the document including concepts extracted from the document. The concepts extracted from the document include a subset of the concepts in the concept graph. The computing also includes combining the a priori information and the concept graph to generate a posteriori information that indicates a likelihood that the document is related to each of the concepts in the concept graph.