1. A method of modifying a computer-readable elemental data structure, the method comprising: estimating, using at least one processor executing stored program instructions, a relevance associated with an elemental component of the elemental data structure, estimating the relevance comprising estimating a frequency of occurrence in reference data of one or more labels associated with the elemental component; and modifying the elemental data structure, comprising storing the relevance in data associated with the elemental component; wherein the elemental component is encoded as a computer-readable data structure storing the data associated with the elemental component.