libextractor is a library used to extract meta-data from files of arbitrary
type. It is designed to use helper-libraries to perform the actual extraction,
and to be trivially extendable by linking against external extractors for
additional file types. The goal is to provide developers of file-sharing
networks or WWW-indexing bots with a universal library to obtain simple
keywords to match against queries. libextractor contains a shell-command
"extract" that, similar to the well-known "file" command, can extract meta-data
from a file and print the results to stdout. Currently, it supports the formats
HTML, PDF, PS, MP3, OGG, JPEG, GIF, PNG, RPM, ZIP, Real, QT and ASF. Also,
various additional MIME types are detected.