I’ve just pushed a nifty feature for browsing the “Melvil Decimal System” (MDS).

What is MDS? MDS is the Dewey Decimal System, Melvil Dewey’s innovative classification system, as it has been applied to books in LibraryThing members’ books. The wording comes from out-of-copyright sources.

The browse system is nifty. It was to some degree inspired by the elegant user interface to Tom Hickey’s OCLC DeweyBrowser. It is also interesting to see how the classification stacks up against LibraryThing tags. Here are some examples:

• 222.2 — Religion > Bible > Historical books > Joshua
• 569.8 — Science > Paleontology > Mammals > Non-human primates
• 832 — Literature > German Literature > Drama

As usual, the system is not complete. It does not yet show you how your books stack up against the system. That is coming.

Why MDS? Although he invented his system in 1876, and has been dead for 79 years, Dewey lives on. The library conglomerate OCLC continues to produce new editions, which are copyrighted. And the terms “Dewey,” “Dewey Decimal,” “DDC” and so forth are registered trademarks of OCLC. In the past OCLC has been touchy about Dewey. They once sued the Library Hotel for putting books in rooms according to the rooms’ Dewey number. So we aren’t taking any chances.

Although OCLC updates the Dewey Decimal System, they cannot own the numbers themselves, which are assigned by librarians around the world. Nor can they own the system as it existed in 1922—for that edition is out of copyright.

Make it stop!

Help us out! Knowing the numbers is one thing, but the words bring them alive. Every number has a space for wording, both original (1922) and modern. Members are invited to help fill it out, at least for the top tiers. The original wording should come from Dewey’s 1922 edition, with one difference. Dewey was a spelling-reform nut, and all the later editions of his work are in his semi-phonetic spelling system. This spelling is unbearable, so convert it to standard spelling.

For the “modern” wording, you may modernize both terminology and sentiment. Dewey used “sociology” in the sense of “Social science” and his religion section refers to “Mohammedanism” and “Minor Christian sects.” Those can all be improved. But improvements should reflect only modernity, not the wording of in-copyright editions of the Dewey Decimal System.*

As with other Common Knowledge sections, MDS can also be translated. Indeed, one of the coolest things I’ve seen in a while was a user translating the system into Swedish just a few minutes after launch. There is no current Swedish translation of the Dewey Decimal System.

Lastly, I got into this to help Fleela, Zoe and the other members of the Dewey Decimal Challenge group, “Read a book from every Dewey Decimal category.” Fun idea. You should try it.

What’s missing The feature is, as usual, intentionally half-done. Here are some contemplated features.

• Connection to YOUR library
• Links from your catalog, other pages
• The Library of Congress System

Come talk about it on LibraryThing Talk.

* In many cases, OCLC’s changes haven’t trickled down to the libraries that use the system. DDC 288, formerly for Unitarianism**, is now blank. But both OCLC’s DeweyBrowser and LibraryThing’s MDS browser show books there—a Channing fest to be sure.
** That Unitarianism gets as much space as Catholicism, Judaism and Islam speaks to Dewey’s western Massachusetts world-view.

Dewey, Dewey Decimal, Dewey Decimal Classification, DDC and OCLC are registered trademarks of OCLC. Read more about OCLC and the DDC on their website. LibraryThing is not affiliated with OCLC, but we have the same hatter.