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The Portable Document Format (PDF) is a format not tied to a specific platform or software application. A PDF document can hold formatted text and images. PDF is an open standard, making it useful in a variety of places.
There are a large number of documents stored as PDF, making it a valuable source of data. There are several Java APIs that allow access to PDF documents, including Apache POI and PDFBox. Techniques for extracting information from a PDF document are illustrated in Chapter 3 , Data Cleaning.
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