Here's a short story:

The Dewey Decimal Classification (DDC), or Dewey Decimal System, is a proprietary library classification system first published in the United States by Melvil Dewey in 1876. It has been revised and expanded through 23 major editions, the latest issued in 2011, and has grown from a four-page pamphlet in 1876. It is also available in an abridged version suitable for smaller libraries. It is currently maintained by the Online Computer Library Center (OCLC), a non-profit cooperative that serves libraries. OCLC licenses access to an online version for catalogers called "WebDewey". 

The Decimal Classification introduced the concepts of "relative location" and "relative index" which allow new books to be added to a library in their appropriate location based on subject. Libraries previously had given books permanent shelf locations that were related to the order of acquisition rather than topic. The classification's notation makes use of three-digit Arabic numerals for main classes, with fractional decimals allowing expansion for further detail. Using Arabic numerals for symbols, it is flexible to the degree that numbers can be expanded in linear fashion to cover special aspects of general subjects. A library assigns a classification number that unambiguously locates a particular volume in a position relative to other books in the library, on the basis of its subject. The number makes it possible to find any book and to return it to its proper place on the library shelves. The classification system is used in 200,000 libraries in at least 135 countries. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: Who published the DDC?
Guess: Melvil Dewey

Question: When?
Guess: 1876

Question: Where?
Guess: the United States

Question: Is DDC an acronym?
Guess: yes

Question: What does it stand for?
Guess: Dewey Decimal Classification

Question: Is it called anything else?
Guess: Dewey Decimal System

Question: What concepts were introduced with this program?
Guess: "relative location" and "relative index"

Question: What criteria did it use to put the books in a location?
Guess: subject

Question: What type of numerals did it use for main classes of books?
Guess: Arabic

Question: 2 digit?
Guess: no

Question: How many?
Guess: Three

Question: Were fractional decimals used as well?
Guess: yes

Question: What did this allow expansion for?
Guess: further detail.

Question: Was the use of numerals rigid?
Guess: no

Question: How was its use described?
Guess: it is flexible

Question: How many editions have there been?
Guess: 23

Now answer the following question in the same format.

Question: When was the last released?

2011,