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# Components

Some of the standard grammar files contain components, which enable you to extract attributes from matched phrases, such as topic, subject, and positive or negative sentiments. The attributes are called components because they are the components of a single match.

For example, if you used sentiment analysis to match the phrase Their service is fantastic as conveying positive sentiment, you can then use components to identify service as the subject matter, and fantastic as the adjective that describes the subject (note that the sentiment is not necessarily an adjective in all cases). You can also set up components when you write your own custom grammar files.

NOTE:

`sentiment_basic_eng.ecr` does not support the TOPIC or SENTIMENT components.

For more information on how to configure and define components in your grammar files, and when to use them, refer to IDOL Expert.

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