Correction: OpinionML—Opinion Markup Language for Sentiment Representation. <i>Symmetry</i> 2019, 11, 545 by Mohammed Attik, Malik Muhammad Saad Missen, Mickaël Coustaty, Gyu Sang Choi, Fahd Saleh Alotaibi, Nadeem Akhtar, Muhammad Zeeshan Jhandir, V. B. Surya Prasath, Nadeem Salamat, Mujtaba Husnain

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