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You can use this REST API to perform:
Sentiment Analysis: Structure every part of an opinion into positive/neutral/negative, identify the topic of the opinion, the sentiment expression used, and get a numeric value for each of the sentiment-bearing phrases.
Entity Extraction: Extract from text names, places, firms, twitter users, and others.
Categorization: Classify text using a custom build taxonomy
Concept Analysis: Linguistically based structuring text.