While this method might be useful and accurate for smaller data with limited entity types and relations, it cannot scale to extract entities and their relationships in web due to the sheer volume and heterogeneity of data.
open domain information extraction systems such as Reverb (Fader et al., 2011), TEXTRUNNER (Yates et al., 2007) and NELL (Carlson et al., 2010) have received added attention in recent times.