# Fields

In IDOL, all the data in a document is split up into fields. Usually, there is a title field and a field containing the body of the document content. Depending on the repository and type of data, there are often also:

- metadata fields, containing information about the file, such as the creation date and file type.

- document detail fields, containing additional information about the content, such as the author, book title, and publication date.

When you decide what content to index, you must also decide how to store different document fields. At this stage, you consider the balance between the size of the index, the time taken to index data, and the speed of query responses.

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