Extending HeidelTime for Temporal Expressions Referring to Historic Dates
نویسندگان
چکیده
Pattern / Normalization Resources •1–4 digit years • “BC/AD” phrases Rules •several modifications and new rules • rules with explicit “BC/AD” phrases • rules without “BC/AD” phrases Normalization Strategies •calculations for relative and underspecified expressions •disambiguation of 2-digit years •expressions without “BC/AD” phrases ∗preliminary normalized to AD dates ∗ if explicit BC dates in documents, then check for chronology Evaluation
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