MEAD::Extract opens and has methods to access various parts of a MEAD-style extract.
Since the extract format differs between DUC-sytle extracts and MEAD-style extracts,
we have a two classes.
- $extract = MEAD::Extract->open_from_file($filename);
-
- $num = $extract->get_num_sentences();
-
- $did = $extract->get_SNO_for_sentence($sentence_index);
-
- $sno = $exract->get_SNO_for_sentence($sentence_index);
-