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Hi Puteri,
The Rosette Text Analysis extension for RapidMiner Studio has an operator called "Entity Sentiment", which will extract entities ((like people, places, products) from your unstructured text in an ExampleSet and return the sentiment of the entities within the submitted text. An update will be released soon to return the sentiment of even more entity "types", like dates, email addresses, etc.
Rosette has a lot of models pre-trained and ready to use, if that's more of the workflow you'd like to use. Just sign up for a free account of the Rosette API and download that extension to RapidMiner and you should be able to pass in unstructured English or Spanish text in an ExampleSet to the "Entity Sentiment" operator, and see every entity and its associated sentiment result (positive, negative, or neutral).
Let me know if you have any questions!
-Lauren