TY  - CHAP
U1  - Konferenzveröffentlichung
A1  - Ruppenhofer, Josef
A1  - Somasundaran, Swapna
A1  - Wiebe, Janyce
T1  - Finding the Sources and Targets of Subjective Expressions
T2  - Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08)
N2  - As many popular text genres such as blogs or news contain opinions by multiple sources and about multiple targets, finding the sources and targets of subjective expressions becomes an important sub-task for automatic opinion analysis systems. We argue that while automatic semantic role labeling systems (ASRL) have an important contribution to make, they cannot solve the problem for all cases. Based on the experience of manually annotating opinions, sources, and targets in various genres, we present linguistic phenomena that require knowledge beyond that of ASRL systems. In particular, we address issues relating to the attribution of opinions to sources; sources and targets that are realized as zero-forms; and inferred opinions. We also discuss in some depth that for arguing attitudes we need to be able to recover propositions and not only argued-about entities. A recurrent theme of the discussion is that close attention to specific discourse contexts is needed to identify sources and targets correctly.
KW  - opinion mining
KW  - machine learning
KW  - Semantische Analyse
KW  - Automatische Sprachanalyse
Y1  - 2008
U6  - https://nbn-resolving.org/urn:nbn:de:bsz:mh39-53181
UN  - https://nbn-resolving.org/urn:nbn:de:bsz:mh39-53181
UR  - http://www.lrec-conf.org/proceedings/lrec2008/summaries/709.html
SN  - 2-9517408-4-0
SB  - 2-9517408-4-0
SP  - 2781
EP  - 2788
PB  - ELRA
ER  -