iText ® is a library that contains classes to create and manipulate documents in the Portable Document Format (PDF).
XMLWorker is an extra component for iText®, a Free/Open Source PDF library. The first XML to PDF implementation, is a new version of the old HTMLWorker that used to be shipped with iText.
RUPS is an abbreviation for Reading and Updating PDF Syntax. RUPS is a tool built on top of iText® that allows you to look inside a PDF document and browse the different PDF objects and content streams.
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