43. The computer-readable storage medium of claim 39 , wherein determining the secondary user intent for the first substring comprises: determining a confidence score for a plurality of interpretations of the first substring; and determining the secondary user intent for the first substring based on an interpretation of the plurality of interpretations of the first substring having the highest confidence score.
43. The computer-readable storage medium of claim 39 , wherein determining the secondary user intent for the first substring comprises: determining a confidence score for a plurality of interpretations of the first substring; and determining the secondary user intent for the first substring based on an interpretation of the plurality of interpretations of the first substring having the highest confidence score. 44. The computer-readable storage medium of claim 43 , wherein the plurality of interpretations of the first substring exclude interpretations from domains that do not output the first type of concept.