16. The system of claim 12 , wherein the processor is further configured to: identify the part of the natural language text as comprising at least one sentence in which a metric indicative of a quality of associating the tokens with respective categories falls below a threshold value.
16. The system of claim 12 , wherein the processor is further configured to: identify the part of the natural language text as comprising at least one sentence in which a metric indicative of a quality of associating the tokens with respective categories falls below a threshold value. 18. The system of claim 16 , wherein the metric is provided by a ratio of a number of tokens that have been correctly associated with categories to a total number of tokens representing named entities in the natural language text.