OpenDover is the leading webservice that lets you tag your documents based on sentiments and emotions found in your documents. The OpenDover API can handle different ways of sentiment tagging, depending on what your needs are, or what the content is that you provide via the API.

The OpenDover knowledge base consists of thousands of opinion words, domain-related words and relations organized hierarchically. Since OpenDover is ontology-based, it can recognize the subject domains of the documents parsed via the API.

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