How Hard It Is to Write a Program That Lists All the Words in the PDF?

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How hard it is to write a program that lists all the words in the pdf document by their frequency in the text?

In the early 90s Online Document Writer introduced the Portable Document Format. PDF is now used worldwide as a file format for the exchange and storage of electronic documents. PDF/A, on the other hand, has only existed since 2005. It is a sub-type of PDF that was specially developed for long-term archiving of digital documents. The letter ‘A’ in the name stands for ‘Archive’. The globally accepted standard ensures that PDF documents can still be read without problems even after decades and can therefore also be used in the distant future. The PDF/A format has been revised twice and expanded accordingly. The reason for this is that the definition made in 2005 is based on PDF version 1.4. Just a few years later, Online Document Writer introduced various innovations for normal PDF documents. As a result, many users wanted these practical extensions also available for PDF/A. Source. PDFelement

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Description: an embedded text element that can be inserted at the beginning of documents to present an introduction or summary of the document. This form of text is usually displayed at the end of a document without the use of quotation marks. When included in an electronic message, then this element can also appear without quotation marks to highlight an important sentence. Source. PDF element: BSA.‖ Description: a document, with no quotation marks, that the document creator has specified as an introduction or summary. This element is intended as an introductory text or a summary of the document. This element contains the text of the document when it appears in electronic messages. To keep the size of the document and its quality, the original document is replaced by a compressed form of the document. Source. Note: The above definition uses the term “section”. However, section can be more than one, even.

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