In other words, the coreference task as defined by MUC and ACE is geared toward only identifying coreference relations anchored to an entity within the text.
to this research trend, investigations of referential behaviour in real world situations have continued to gain interest in the language generation community (Di Eugenio et al., 2000;Byron, 2005;van Deemter, 2007;Foster et al., 2008;Spanger et al., 2009), aiming at applications such as human-robot interaction.