This is a plugin designed for the Bookpedia book management software for OS X. It was originally built based on version 5.1 of Bookpedia.
The plugin searches for book data from the Chinese website Douban and returns its results for entry into Bookpedia. Douban has a fairly large database, mainly of books published in Mainland China and with data in Simplified Chinese.
The source code for this plugin is released in the Open Source, under the GNU Lesser General Public License.