We analyze the error types for the wrong extraction made by our system.
for each error, we assign it to one (or more) of the following causes: (1) a cluster (and hence attribute type) was excluded due to the 1-to-1 mapping methodology described above (NOT IN MAPPING); (2) the value extracted by the system was not extracted by any of the annotators (WRONG EXT); (3) wrong information typei.e., the token belonged to a wrong cluster (WRONG TYPE); (4) incorrect tokenization for an information type (TK-<type name>).