For example, if the size of the sliding window is 5, the decision on the targeted word is made based on its features as well as the features of its two immediate left and right neighbors (i.e., +/-2 words Abdallah, Shaalan, and Shoaib 2012).
an approach relying only on looking up entries in proper noun dictionaries would not be an appropriate way to tackle this problem, as ambiguous tokens/words that fall in this category are more likely to be used as non-proper nouns in text (Algahtani 2011).