iText is a library that contains classes to generate and manipulate documents in the Portable Document Format (PDF). Document manipulation includes splitting, merging, and filling out forms (AcroForms, static and dynamic XFA forms).
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Some functionality that was needed in XML Worker 1.0.0 was introduced. For instance, high level interfaces (Indentable, Spaceable) and a WritableDirectElement class were introduced. The logging that was introduced in 5.1.0 was changed so that it works the same way other logging frameworks do. A simple System.out logger, SysoLogger, is now provided. Some bugs were fixed to solve PDF reading and parsing problems, to solve problems with list symbols, and to avoid ClassCastExceptions when reading/manipulating existing OCG layers.