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+name extract
+category Package
+shortdesc Extract specific content from a source document and write that to a target document
+longdesc The package provides the means to extract specific content from a
+longdesc source document and write that to a target document. One could,
+longdesc for instance, use this to extract all exercises from lecture notes
+longdesc and generate an exercises book on the fly. The package also
+longdesc provides an environment which writes its body entirely to the
+longdesc target file. Another environment will write to the target file,
+longdesc but will also execute the body. This allows to share code (for
+longdesc instance, a preamble) between the source document and the target
+longdesc file. Finally, the package provides an interface to conditionally
+longdesc extract content. With a single option in the \usepackage command,
+longdesc one can specify exactly which commands (counted from the start of
+longdesc the document) should be extracted and which not. This might be
+longdesc useful for extracting specific slides from a presentation and use
+longdesc them in a new file. [description copied from TeX Catalogue]