Welcome to The Registry!
This is the home page for the Open Metadata Registry (formerly the NSDL Registry).
The Metadata Registry provides services to developers and consumers of controlled vocabularies and is one of the first production deployments of the RDF-based Semantic Web Community's Simple Knowledge Organization System (SKOS)
How to begin
Step-by-step illustrated instructions...
If you just want to experiment and play around a bit, go on over to the Metadata Registry Sandbox. The code is exactly the same, but it's using a non-production database. (Please be careful not to kick any sand out of the box)
NOTE: The sandbox has its own domain now. If you had bookmarked the beta site thinking that it was the sandbox (and we did say that), it will shortly be a real beta site again complete with broken code, wacky ideas, and disappearing data.
Please change your sandbox bookmarks to point to the Metadata Registry Sandbox. Any of the sandcastles that you had built in the beta, back when you thought it was the sandbox, are still there.
Posted by: Jon at
20:54 on Friday, September 19, 2014 GMT
Part of our server move was prompted by the ever-increasing indexing of our many, many activity feeds. In addition to the overall history feed on the front page, each vocabulary has a history feed: Metadata Registry Change History for Element Set: ‘MARC 21 Elements 00X’ Each element or concept also has its own history feed: … Continue reading Activity feeds fixed →
Posted by: Jon at
21:50 on Thursday, September 18, 2014 GMT
One of the side effects of our server move was the need to reconfigure our locally-hosted transactional email services, which were always a little flaky — if you have tried to reset your password lately you will no doubt have noticed that the promised email never arrived. That’s fixed now. We switched from self-hosted to … Continue reading Password reset fixed →
Posted by: Jon at
21:02 on Friday, August 15, 2014 GMT
…from Rackspace to Digital Ocean and from one large-ish server to several smaller ones, from a relatively prehistoric version of RedHat to the latest Ubuntu 14LTS, from Zend Server+Apache to nginx (openresty actually), and from PHP5.2 to PHP5.5. It really wasn’t as painful as it sounds like it should have been. As part of the move, … Continue reading Server move in progress →
Posted by: Jon at
17:52 on Wednesday, July 23, 2014 GMT
Normally the Registry just hums along quietly and doesn’t demand too much attention. But the last system update we performed seems to have altered our memory usage pretty dramatically and we’re quite suddenly having out-of-memory issues and some heavy swapping. We’ve expanded the server capacity twice already as a stopgap while we investigate, but before … Continue reading Server issues →
Posted by: Jon at
20:36 on Saturday, February 16, 2013 GMT
When we first designed the NSDL Registry, part of the requirements was that it be able to run in Lynx (seriously) and be usable without JavaScript in all browsers including all versions of IE. As you will probably have noticed, the world of web development has changed a bit in the last 8 years. Lately … Continue reading Still here, folks →
Posted by: Jon at
23:32 on Wednesday, September 28, 2011 GMT
Until lately we’ve been pretty happy with our ISP, Dreamhost. But a few months ago, after several during-the-presentation meltdowns of the Registry we determined that we needed to move to a higher-performing, more reliable server. We could have done the easy thing and moved to a Virtual Private Server at Dreamhost. Instead, we setup an … Continue reading Whoops →
Posted by: Jon at
14:55 on Thursday, April 14, 2011 GMT
We’re using Benjamin Nowack‘s excellent ARC libraries for a tiny bit of our RDF management. It may surprise you to know that we don’t use a triple store as our primary data store, but we do too many things with the data that we think are cumbersome at best when managed exclusively in a triple store (a subject … Continue reading SPARQL queries →
Posted by: Diane Hillmann at
19:20 on Tuesday, October 05, 2010 GMT
As of today, the link to Step-by-Step instruction on the Registry front page has been updated (and not a moment too soon). The new link still goes to the Registry Wiki, but the link itself is different, so those of you eager users who have bookmarked the old instructions might want to take a look … Continue reading Check Your Bookmarks! →
Posted by: Diane Hillmann at
21:52 on Tuesday, July 20, 2010 GMT
As of this week, the familiar NSDL Regisry has a new name–the Open Metadata Registry–and a new logo. The name change reflects the fact that we’re no longer receiving funding from the National Science Foundation on behalf of the National Science Digital Library (NSDL), but also recognizes that the Registry has become one of the … Continue reading Announcing the New Open Metadata Registry →
Posted by: Jon at
12:52 on Thursday, April 08, 2010 GMT
Over the years we’ve been engaged in a number of discussions in which the ‘readability’ of URIs was raised, either as an issue with non-readable URIs or as a requirement in new URI schemes. At the Registry, we understand and are sensitive to the desire for human readability in URIs. However embedding a language-specific label … Continue reading Readable URIs →
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On Mon Oct 5 2026 at 21:50:42 UTC, librisprime, working on the Concept: Worker placement games, added the definition (en) Property: This mechanism requires players to draft individual actions from a set that is available to all players. In a given round, drafting is done one-at-a-time and in turn order until all players have had a chance to draft individual actions. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:50:16 UTC, librisprime, working on the Concept: Word games, added the definition (en) Property: Word games often require players to competitively use their knowledge of language. Language knowledge in Word games is often focused on spelling and definitions. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:49:55 UTC, librisprime, working on the Concept: Wellness games, added the definition (en) Property: Wellness games promote mental or physical health by increasing knowledge and modeling healthy behaviors through play. -- wikipedia.org
On Mon Oct 5 2026 at 21:49:13 UTC, librisprime, working on the Concept: War games, added the definition (en) Property: War games are games that depict military actions. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:49:05 UTC, librisprime, working on the Concept: War games, added the related Property: http://metadataregistry.org/uri/gttg/1057
On Mon Oct 5 2026 at 21:48:46 UTC, librisprime, working on the Concept: Video game-themed games, added the definition (en) Property: Video game-themed games are games thematically linked with or inspired by a video game franchise or genre. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:48:20 UTC, librisprime, working on the Concept: Trading games, added the definition (en) Property: In trading games the players can exchange game items between each other. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:48:06 UTC, librisprime, working on the Concept: Trading games, added the related Property: http://metadataregistry.org/uri/gttg/1065
On Mon Oct 5 2026 at 21:47:58 UTC, librisprime, working on the Concept: Trading games, added the related Property: http://metadataregistry.org/uri/gttg/1062
On Mon Oct 5 2026 at 21:47:50 UTC, librisprime, working on the Concept: Trading games, added the related Property: http://metadataregistry.org/uri/gttg/1025
On Mon Oct 5 2026 at 21:46:48 UTC, librisprime, working on the Concept: Territory building games, added the definition (en) Property: Territory Building games have the players establish and/or amass control over a specific area. Often, these games employ Area Control and Area Enclosure mechanics, in which the areas are not necessarily delineated at the beginning of the game but are instead contained from larger territories as the game progresses.
On Mon Oct 5 2026 at 21:46:29 UTC, librisprime, working on the Concept: War games, added the related Property: http://metadataregistry.org/uri/gttg/1064
On Mon Oct 5 2026 at 21:45:58 UTC, librisprime, working on the Concept: War games, added the related Property: http://metadataregistry.org/uri/gttg/1062
On Mon Oct 5 2026 at 21:44:22 UTC, librisprime, working on the Concept: Spelling games, added the definition (en) Property: Players arrange cards, tiles, or other components that represent an individual letter or small group of letters to create words. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:43:51 UTC, librisprime, working on the Concept: Solo games, added the definition (en) Property: Solo or solitary games are made for a single-player or have a single-player option. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:43:31 UTC, librisprime, working on the Concept: Simulation games, added the definition (en) Property: Simulation games attempt to create a realistic model actual events or situations. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:43:04 UTC, librisprime, working on the Concept: Set collection games, added the definition (en) Property: The primary goal of set collection games is to encourage a player to collect a set of items. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:41:53 UTC, librisprime, working on the Concept: Serious games, added the definition (en) Property: Serious games are pedagogical in nature and may include elements of storytelling, experiential learning, immersion, or simulation to convey the educational purpose. They may be able to be played solo for personal benefit or in a group setting, such as for institutional teambuilding. -- wikipedia.org
On Mon Oct 5 2026 at 21:41:37 UTC, librisprime, working on the Concept: Serious games, added the related Property: http://metadataregistry.org/uri/gttg/1026
On Mon Oct 5 2026 at 21:40:49 UTC, librisprime, working on the Concept: Science fiction games, added the definition (en) Property: Science fiction games often have themes relating to imagined possibilities in the sciences. Such games need not be futuristic; they can be based on an alternative past. (For example, the writings of Jules Verne and the Star Wars saga are set before present time.) Many of the most popular Science fiction games are set in outer space, and often involve alien races.
On Mon Oct 5 2026 at 21:40:34 UTC, librisprime, working on the Concept: Roleplaying games, added the definition (en) Property: A game in which participants adopt the roles of imaginary characters in an adventure under the direction of a Game Master. -- dictionary.com
On Mon Oct 5 2026 at 21:40:05 UTC, librisprime, working on the Concept: Real-time games, added the definition (en) Property: Real-time games often allow for players to take their turns (or part of their turns) simultaneously. This is in contrast to turn-based games. There are also some Real-time games in which there is a consequence if a player does not play their turn in a set amount of time. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:39:21 UTC, librisprime, working on the Concept: Trivia games, added the related Property: http://metadataregistry.org/uri/gttg/1050
On Mon Oct 5 2026 at 21:38:36 UTC, librisprime, working on the Concept: Puzzle Games, added the definition (en) Property: Puzzle games are those in which the players are trying to solve a puzzle. Many puzzle games require players to use problem solving, pattern recognition, organization and/or sequencing to reach their objectives. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:37:56 UTC, librisprime, working on the Concept: Print and Play games, added the definition (en) Property: Print & Play (versions of) games are not published in a physical form. Instead, the rules and (most) components are available in a digital format, and players are expected to print them off and assemble them themselves. Often, some additional, non-printable components are required as well. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:37:38 UTC, librisprime, working on the Concept: Political games, added the definition (en) Property: Political games encourage players to use their character’s authority to manipulate societal activities and policy. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:37:08 UTC, librisprime, working on the Concept: Physics games, added the broader Property: http://metadataregistry.org/uri/gttg/1054
On Mon Oct 5 2026 at 21:36:44 UTC, librisprime, working on the Concept: Party games, added the definition (en) Property: Party games are games that encourage social interaction. They generally have easy setups, simple rules, and they can accommodate large groups of people and play in a short amount of time. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:36:35 UTC, librisprime, working on the Concept: Trivia games, added the related Property: http://metadataregistry.org/uri/gttg/1045
On Mon Oct 5 2026 at 21:36:35 UTC, librisprime, working on the Concept: Party games, added the related Property: http://metadataregistry.org/uri/gttg/1068
On Mon Oct 5 2026 at 21:36:17 UTC, librisprime, working on the Concept: Novel-based games, added the definition (en) Property: Novel-based games feature characters from a book or series of books and may incorporate other elements from the book as well. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:35:52 UTC, librisprime, working on the Concept: Nautical games, added the definition (en) Property: Nautical games involve sailors, ships, and/or maritime navigation as a major component of the theme or gameplay. Most Nautical games require players to effectively control ships as an objective. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:35:26 UTC, librisprime, working on the Concept: Mystery games, added the definition (en) Property: Mystery games often involve an unsolved murder or a mystery. A requirement of these games is usually for players to investigate and determine the details and/or perpetrator(s). -- boardgamegeek.com
On Mon Oct 5 2026 at 21:34:59 UTC, librisprime, working on the Concept: Movie/TV/Radio themed games, added the definition (en) Property: Movie/TV/Radio themed games feature characters from a movie or a series of movies, a television show, and/or a radio program and are thematically linked to these programs. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:33:01 UTC, librisprime, working on the Concept: Memory games, added the definition (en) Property: Memory games require players to retain and recall previous game events or information as an objective. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:31:24 UTC, librisprime, working on the Concept: Horror games, added the definition (en) Property: Horror games often contain themes and imagery depicting morbid and supernatural elements. -- boardgamegeek.com
On Mon Oct 5 2026 at 21:31:08 UTC, librisprime, working on the Concept: Mystery games, added the related Property: http://metadataregistry.org/uri/gttg/1036
On Mon Oct 5 2026 at 21:31:08 UTC, librisprime, working on the Concept: Horror games, added the related Property: http://metadataregistry.org/uri/gttg/1042
On Mon Oct 5 2026 at 21:30:49 UTC, librisprime, working on the Concept: War games, added the related Property: http://metadataregistry.org/uri/gttg/1035
On Mon Oct 5 2026 at 21:30:49 UTC, librisprime, working on the Concept: History games, added the related Property: http://metadataregistry.org/uri/gttg/1070
On Mon Oct 5 2026 at 21:30:30 UTC, librisprime, working on the Concept: Hidden role games, added the definition (en) Property: Hidden role games have an element that is hidden from one or more players. There may be secret consequences for actions: killing fellow players, releasing monsters, or a group of players may be trying to find another player whose true identity is only known to themselves.
On Mon Oct 5 2026 at 21:30:24 UTC, librisprime, working on the Concept: Mystery games, added the related Property: http://metadataregistry.org/uri/gttg/1034
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