3. The method according to claim 1 , wherein the second rank component is generated on the basis of a particular weight factor being linked to each position in the descriptive field, the weight factors reflecting a distinctive feature's significance with respect to its position in the descriptive field.
3. The method according to claim 1 , wherein the second rank component is generated on the basis of a particular weight factor being linked to each position in the descriptive field, the weight factors reflecting a distinctive feature's significance with respect to its position in the descriptive field. 4. The method according to claim 3 , wherein the second rank component is generated on the basis of a relevancy parameter reflecting a distinctive feature's significance in relation to other distinctive features in a particular position in the descriptive field.