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Archive for the 'too big to know' Category

It’s good to have Hoder — Hossein Derakhshan— back. After spending six years in an Iranian jail, his voice is stronger than ever. The changes he sees in the Web he loves are distressingly real.

Hoder was in the cohort of early bloggers who believed that blogs were how people were going to find their voices and themselves on the Web. (I tried to capture some of that feeling in a post a year and a half ago.) Instead, in his great piece in Medium he describes what the Web looks like to someone extremely off-line for six years: endless streams of commercial content.

Some of the decline of blogging was inevitable. This was made apparent by Clay Shirky’s seminal post that showed that the scaling of blogs was causing them to follow a power law distribution: a small head followed by a very long tail.

Blogs could never do what I, and others, hoped they would. When the Web started to become a thing, it was generally assumed that everyone would have a home page that would be their virtual presence on the Internet. But home pages were hard to create back then: you had to know HTML, you had to find a host, you had to be so comfortable with FTP that you’d use it as a verb. Blogs, on the other hand, were incredibly easy. You went to one of the blogging platforms, got yourself a free blog site, and typed into a box. In fact, blogging was so easy that you were expected to do it every day.

And there’s the rub. The early blogging enthusiasts were people who had the time, skill, and desire to write every day. For most people, that hurdle is higher than learning how to FTP. So, blogging did not become everyone’s virtual presence on the Web. Facebook did. Facebook isn’t for writers. Facebook is for people who have friends. That was a better idea.

But bloggers still exist. Some of the early cohort have stopped, or blog infrequently, or have moved to other platforms. Many blogs now exist as part of broader sites. The term itself is frequently applied to professionals writing what we used to call “columns,” which is a shame since part of the importance of blogging was that it was a way for amateurs to have a voice.

That last value is worth preserving. It’d be good to boost the presence of local, individual, independent bloggers.

So, support your local independent blogger! Read what she writes! Link to it! Blog in response to it!

But, I wonder if a little social tech might also help. . What follows is a half-baked idea. I think of it as BOAB: Blogger of a Blogger.

Yeah, it’s a dumb name, and I’m not seriously proposing it. It’s an homage to Libby Miller [twitter:LibbyMiller] and Dan Brickley‘s [twitter:danbri ] FOAF — Friend of a Friend — idea, which was both brilliant and well-named. While social networking sites like Facebook maintain a centralized, closed network of people, FOAF enables open, decentralized social networks to emerge. Anyone who wants to participate creates a FOAF file and hosts it on her site. Your FOAF file lists who you consider to be in your social network — your friends, family, colleagues, acquaintances, etc. It can also contain other information, such as your interests. Because FOAF files are typically open, they can be read by any application that wants to provide social networking services. For example, an app could see that Libby ‘s FOAF file lists Dan as a friend, and that Dan’s lists Libby, Carla and Pete. And now we’re off and running in building a social network in which each person owns her own information in a literal and straightforward sense. (I know I haven’t done justice to FOAF, but I hope I haven’t been inaccurate in describing it.)

BOAB would do the same, except it would declare which bloggers I read and recommend, just as the old “blogrolls” did. This would make it easier for blogging aggregators to gather and present networks of bloggers. Add in some tags and now we can browse networks based on topics.

In the modern age, we’d probably want to embed BOAB information in the HTML of a blog rather than in a separate file hidden from human view, although I don’t know what the best practice would be. Maybe both. Anyway, I presume that the information embedded in HTML would be similar to what Schema.org does: information about what a page talks about is inserted into the HTML tags using a specified vocabulary. The great advantage of Schema.org is that the major search engines recognize and understand its markup, which means the search engines would be in a position to constructdiscover the initial blog networks.

In fact, Schema.org has a blog specification already. I don’t see anything like markup for a blogroll, but I’m not very good a reading specifications. In any case, how hard could it be to extend that specification? Mark a link as being to a blogroll pal, and optionally supply some topics? (Dan Brickley works on Schema.org.)

So, imagine a BOAB widget that any blogger can easily populate with links to her favorite blog sites. The widget can then be easily inserted into her blog. Hidden from the users in this widget is the appropriate Schema.org markup. Not only could the search engines then see the blogger network, so could anyone who wanted to write an app or a service.

I have 0.02 confidence that I’m getting the tech right here. But enhancing blogrolls so that they are programmatically accessible seems to me to be a good idea. So good that I have 0.98 confidence that it’s already been done, probably 10+ years ago, and probably by Dave Winer :)


Ironically, I cannot find Hoder’s personal site; www.hoder.com is down, at least at the moment.

More shamefully than ironically, I haven’t updated this blog’s blogroll in many years.


My recent piece in The Atlantic about whether the Web has been irremediably paved touches on some of the same issues as Hoder’s piece.

[misc][liveblog] Alex Wright: The secret history of hypertext

I’m in Oslo for Kunnskapsorganisasjonsdagene, which my dear friend Google Translate tells me is Knowledge Organization Days. I have been in Oslo a few times before — yes, once in winter, which was as cold as Boston but far more usable — and am always re-delighted by it.

Alex Wright is keynoting this morning. The last time I saw him was … in Oslo. So apparently Fate has chosen this city as our Kismet. Also coincidence. Nevertheless, I always enjoy talking with Alex, as we did last night, because he is always thinking about, and doing, interesting things. He’s currently at Etsy , which is a fascinating and inspiring place to work, and is a professor interaction design,. He continues to think about the possibilities for design and organization that led him to write about Paul Otlet who created what Alex has called an “analog search engine”: a catalog of facts expressed in millions of index cards.

NOTE: Live-blogging. Getting things wrong. Missing points. Omitting key information. Introducing artificial choppiness. Over-emphasizing small matters. Paraphrasing badly. Not running a spellpchecker. Mangling other people’s ideas and words. You are warned, people.

Alex begins by telling us that he began as a librarian, working as a cataloguer for six years. He has a library degree. As he works in the Net, he finds himself always drawn back to libraries. The Net’s fascination with the new brings technologists to look into the future rather than to history. Alex asks, “How do we understand the evolution of the Web and the Net in an historical context?” We tend to think of the history of the Net in terms of computer science. But that’s only part of the story.

A big part of the story takes us into the history of libraries, especially in Europe. He begins his history of hypertext with the 16th century Swiss naturalist Conrad Gessner who created a “universal bibliography” by writing each entry on a slip of paper. Leibniz used the same technique, writing notes on slips of paper and putting them in an index cabinet he had built to order.

In the 18th century, the French started using playing cards to record information. At the beginning of the 19th, the Jacquard loom used cards to guide weaving patterns, inspiring Charles Babbage to create what many [but not me] consider to be the first computer.

In 1836, Isaac Adams created the steam powered printing press. This, along with economic and social changes, enabled the mass production of books, newspapers, and magazines. “This is when the information explosion truly started.”

To make sense of this, cataloging systems were invented. They were viewed as regimented systems that could bring efficiencies … a very industrial concept, Alex says.

“The mid-19th century was also a period of networking”: telegraph systems, telephones, internationally integrated postal systems. “Goods, people, and ideas were flowing across national borders in a way they never had before.” International journals. International political movements, such as Marxism. International congresses (conferences). People were optimistic about new political structures emerging.

Alex lists tech from the time that spread information: a daily reading of the news over copper wires, pneumatic tubes under cities (he references Molly Wright Steenson‘s great work on this), etc.

Alex now tells us about Paul Otlet, a Belgian who at the age of 15 started designing his own cataloging system. He and a partner, Henri La Fontaine, started creating bibliographies of disciplines, starting with the law. Then they began a project to create a universal bibliography.

Otlet thought libraries were focused on the wrong problem. Getting readers to the right book isn’t enough. People also need access to the information in the books. At the 1900 [?] world’s fair in Paris, Otlet and La Fontaine demonstrated their new system. They wanted to provide a universal language for expressing the connections among topics. It was not a top-down system like Dewey’s.

Within a few years, with a small staff (mainly women) they had 15 million cards in their catalog. You could buy a copy of the catalog. You could send a query by telegraphy, and get a response telegraphed back to you, for a fee.

Otlet saw this in a bigger context. He and La Fontaine created the Union of International Associations, an association of associations, as the governing body for the universal classification system. The various associations would be responsible for their discpline’s information.

Otlet met a Scotsman named Patrick Geddes who worked against specialization and the fracturing of academic disciplines. He created a camera obscura in Edinburgh so that people could see all of the city, from the royal areas and the slums, all at once. He wanted to stitch all this information together in a way that would have a social effect. [I’ve been there as a tourist and had no idea!] He also used visual forms to show the connections between topics.

Geddes created a museum, the Palais Mondial, that was organized like hypertext., bringing together topics in visually rich, engaging displays. The displays are forerunners of today’s tablet-based displays.

Another collaborator, Hendrik Christian Andersen, wanted to create a world city. He went deep into designing it. He and Otlet looked into getting land in Belgium for this. World War I put a crimp in the idea of the world joining in peace. Otlet and Andersen were early supporters of the idea of a League of Nations.

After the War, Otlet became a progressive activist, including for women’s rights. As his real world projects lost momentum, in the 1930s he turned inward, thinking about the future. How could the new technologies of radio, television, telephone, etc., come together? (Alex shows a minute from the documentary, The Man who wanted to Classify the World.”) Otlet imagines a screen and television instead of books. All the books and info are in a separate facility, feeding the screen. “The radiated library and the televised book.” 1934.

So, why has no one ever heard of Otlet? In part because he worked in Belgium in the 1930s. In the 1940s, the Nazis destroyed his work. They replaced his building, destrooying 70 tons of materials, with an exhibit of Nazi art.

Although there are similarities to the Web, how Otlet’s system worked was very different. His system was a much more controlled environment, with a classification system, subject experts, etc. … much more a publishing system than a bottom-up system. Linked Data and the Semantic Web are very Otlet-ish ideas. RDF triples and Otlet’s “auxiliary tables” are very similar.

Alex now talks about post-Otlet hypertext pioneers.

H.G. Wells’ “World Brain” essay from 1938. “The whole human memory can be, and probably in a shoirt time will be, made accessibo every individual.” He foresaw a complete and freely avaiable encyclopedia. He and Otlet met at a conference.

Emanuel Goldberg wanted to encode punchcard-style information on microfilm for rapid searching.

Then there’s Vannevar Bush‘s Memex that would let users create public trails between documents.

And Liklider‘s idea that different types of computers should be able to share infromation. And Engelbart who in 1968’s “Mother of all Demos” had a functioning hypertext system.

Ted Nelson thought computer scientists were focused on data computation rather than seeing computers as tools of connection. He invnted the term “hypertext,” the Xanadu web, and “transclusion” (embedding a doc in another doc). Nelson thought that links always should be two way. Xanadu= “intellectual property” controls built into it.

The Internet is very flat, with no central point of control. It’s self-organizing. Private corporations are much bigger on the Net than Otlet, Engelbart, and Nelson envisioned “Our access to information is very mediated.” We don’t see the classification system. But at sites like Facebook you see transclusion, two-way linking, identity management — needs that Otlet and others identified. The Semantic Web takes an Otlet-like approach to classification, albeit perhaps by algorithms rather than experts. Likewise, the Google “knowledge vaults” project tries to raise the ranking of results that come from expert sources.

It’s good to look back at ideas that were left by the wayside, he concludes, having just decisively demonstrated the truth of that conclusion :)

Q: Henry James?

A: James had something of a crush on Anderson, but when he saw the plan for the World City told him that it was a crazy idea.

[Wonderful talk. Read his book.]

Two percent of Harvard’s library collection circulates every year. A high percentage of the works that are checked out are the same as the books that were checked out last year. This fact can cause reflexive tsk-tsking among librarians. But — with some heavy qualifications to come — this is at it should be. The existence of a Long Tail is not a sign of failure or waste. To see this, consider what it would be like if there were no Long Tail.

Harvard’s 73 libraries have 16 million items [source]. There are 21,000 students and 2,400 faculty [source]. If we guess that half of the library items are available for check-out, which seems conservative, that would mean that 160,000 different items are checked out every year. If there were no Long Tail, then no book would be checked out more than any other. In that case, it would take the Harvard community an even fifty years before anyone would have read the same book as anyone else. And a university community in which across two generations no one has read the same book as anyone else is not a university community.

I know my assumptions are off. For example, I’m not counting books that are read in the library and not checked out. But my point remains: we want our libraries to have nice long tails. Library long tails are where culture is preserved and discovery occurs.

And, having said that, it is perfectly reasonable to work to lower the difference between the Fat Head and the Long Tail, and it is always desirable to help people to find the treasures in the Long Tail. Which means this post is arguing against a straw man: no one actually wants to get rid of the Long Tail. But I prefer to put it that this post argues against a reflex of thought I find within myself and have encountered in others. The Long Tail is a requirement for the development of culture and ideas, and at the same time, we should always help users to bring riches out of the Long Tail

The post [2b2k] In defense of the library Long Tail appeared first on Joho the Blog.

A friend is looking into the best way for a city to publish its codes and ordinances to make them searchable and reusable. What are the best schemas or ontologies to use?

I work in a law school library so you might think I’d know. Nope. So I asked a well-informed mailing list. Here’s what they have suggested, more or less in their own words:

Any other suggestions?

The post CityCodesAndOrdinances.xml appeared first on Joho the Blog.

I’ve just finished leading two days of workshops at University of Stuttgart as part of my fellowship at the Internazionales Zentrum für Kultur- und Technikforschung. (No, I taught in English.) This was for me a wonderful experience. First of all, the students were engaged, smart, talked from diverse standpoints, and fun. Second, it reminded me how to teach. I had so much trouble trying to structure sessions, feeling totally unsure how one does so. But the eight 1.5 hour sessions reminded me why I loved teaching.

For my own memory, here are the sessions (and if any of you were there and took notes, I’d love to see them):

Friday

#1 Cyberutopianism, technodeterminism, and Internet exceptionalism defined, with JP Barlow’s Declaration of the Independent of Cyberspace as an example. Class introductions.

#2 Information Age to Age of Connected. Why Ted Nelson’s Xanadu did not succeed the way the Web did. Rough technical architecture of the Net and (perhaps) its embedded political values. Hyperlinks.

#3 Digital order. Everything is miscellaneous? From information Retrieval to search engines. Schema-based databases to tagging.

#4 Networked knowledge. What knowledge looks like once it’s been freed of paper. Four challenges to networked knowledge (with many more added by the students.)

On Saturday we talked about topics that the students decided were interesting:

#1 Mobile net. Is Facebook making us more or less social? Why do we fill up every interstice by using Facebook on mobiles? What does this say about us and the notion of the self?

#2 Downloading. Do you download music illegally? What is your justification? How might artists respond? Why is the term “intellectual property” so loaded?

#3 Education. What makes a great in-person course? What makes for a miserable one? Oddly, many of the characteristics of miserable classes are also characteristics of MOOCs. What might we do about that? How much of this is caused by the fact that MOOCs are construed as courses in the traditional sense?

#4 Internet culture. Is there such a thing? If there are many, is any particular one to be privileged? How does the Net look to a culture that is dedicated to warding off what it says as corrupting influences? End with LolCatBible and the astounding TheJohnnyCashProject

Thank you, students. This experience meant a great deal to me.

[misc] The Wars on Terrorism, Al Qaeda, Cancer, and Dessert

Steve Coll has a good piece in the New Yorker about the importance of Al Qaeda as a brand:

…as long as there are bands of violent Islamic radicals anywhere in the world who find it attractive to call themselves Al Qaeda, a formal state of war may exist between Al Qaeda and America. The Hundred Years War could seem a brief skirmish in comparison.

This is a different category of issue than the oft-criticized “war on terror,” which is a war against a tactic, not against an enemy. The war against Al Qaeda implies that there is a structurally unified enemy organization. How do you declare victory against a group that refuses to enforce its trademark?

In this, the war against Al Qaeda (which is quite preferable to a war against terror — and I think Steve agrees) is similar to the war on cancer. Cancer is not a single disease and the various things we call cancer are unlikely to have a single cause and thus are unlikely to have a single cure (or so I have been told). While this line of thinking would seem to reinforce politicians’ referring to terrorism as a “cancer,” the same applies to dessert. Each of these terms probably does have a single identifying characteristic, which means they are not classic examples of Wittgensteinian family resemblances: all terrorism involves a non-state attack that aims at terrifying the civilian population, all cancers involve “unregulated cell growth” [thank you Wikipedia!], and all desserts are designed primarily for taste not nutrition and are intended to end a meal. In fact, the war on Al Qaeda is actually more like the war on dessert than like the war on cancer, because just as there will always be some terrorist group that takes up the Al Qaeda name, there will always be some boundary-pushing chef who declares that beefy jerky or glazed ham cubes are the new dessert. You can’t defeat an enemy that can just rebrand itself.

I think that Steve Coll comes to the wrong conclusion, however. He ends his piece this way:

Yet the empirical case for a worldwide state of war against a corporeal thing called Al Qaeda looks increasingly threadbare. A war against a name is a war in name only.

I agree with the first sentence, but I draw two different conclusions. First, this has little bearing on how we actually respond to terrorism. The thinking that has us attacking terrorist groups (and at times their family gatherings) around the world is not made threadbare by the misnomer “war against Al Qaeda.” Second, isn’t it empirically obvious that a war against a name is not a war in name only?

The post [misc] The Wars on Terrorism, Al Qaeda, Cancer, and Dessert appeared first on Joho the Blog.

[2b2k] My world leader can beat up your world leader

There’s a knowingly ridiculous thread at Reddit at the moment: Which world leader would win if pitted against other leaders in a fight to the death.

The title is a straightline begging for punchlines. And it is a funny thread. Yet, I found it shockingly informative. The shock comes from realizing just how poorly informed I am.

My first reaction to the title was “Putin, duh!” That just shows you what I know. From the thread I learned that Joseph Kabila (Congo) and Boyko Borisov (Bulgaria) would kick Putin’s ass. Not to mention that Jigme Khesar Namgyel Wangchuck (Bhutan), who would win on good looks.

Now, when I say that this thread is “shockingly informative,” I don’t mean that it gives sufficient or even relevant information about the leaders it discusses. After all, it focuses on their personal combat skills. Rather, it is an interesting example of the haphazard way information spreads when that spreading is participatory. So, we are unlikely to have sent around the Wikipedia article on Kabila or Borisov simply because we all should know about the people leading the nations of the world. Further, while there is more information about world leaders available than ever in human history, it is distributed across a huge mass of content from which we are free to pick and choose. That’s disappointing at the least and disastrous at its worst.

On the other hand, information is now passed around if it is made interesting, sometimes in jokey, demeaning ways, like an article that steers us toward beefcake (although the president of Ireland does make it up quite high in the Reddit thread). The information that gets propagated through this system is thus spotty and incomplete. It only becomes an occasion for serendipity if it is interesting, not simply because it’s worthwhile. But even jokey, demeaning posts can and should have links for those whose interest is piqued.

So, two unspectacular conclusions.

First, in our despair over the diminishing of a shared knowledge-base of important information, we should not ignore the off-kilter ways in which some worthwhile information does actually propagate through the system. Indeed, it is a system designed to propagate that which is off-kilter enough to be interesting. Not all of that “news,” however, is about water-skiing cats. Just most.

Second, we need to continue to have the discussion about whether there is in fact a shared news/knowledge-base that can be gathered and disseminated, whether there ever was, whether our populations ever actually came close to living up to that ideal, the price we paid for having a canon of news and knowledge, and whether the networking of knowledge opens up any positive possibilities for dealing with news and knowledge at scale. For example, perhaps a network is well-informed if it has experts on hand who can explain events at depth (and in interesting ways) on demand, rather than assuming that everyone has to be a little bit expert at everything.

[2b2k][eim] Over my head

I’m not sure how I came into possession of a copy of The Indexer, a publication by the Society of Indexers, but I thoroughly enjoyed it despite not being a professional indexer. Or, more exactly, because I’m not a professional indexer. It brings me joy to watch experts operate at levels far above me.

The issue of The Indexer I happen to have — Vol. 30, No,. 1, March 2012 — focuses on digital trends, with several articles on the Semantic Web and XML-based indexes as well as several on broad trends in digital reading and digital books, and on graphical visualizations of digital indexes. All good.

I also enjoyed a recurring feature: Indexes reviewed. This aggregates snippets of book reviews that mention the quality of the indexes. Among the positive reviews, the Sunday Telegraph thinks that for the book My Dear Hugh, “the indexer had a better understanding of the book than the editor himself.” That’s certainly going on someone’s resumé!

I’m not sure why I enjoy works of expertise in fields I know little about. It’s true that I know a little about indexing because I’ve written about the organization of digital information, and even a little about indexing. And I have a lot of interest in the questions about the future of digital books that happen to be discussed in this particular issue of The Indexer. That enables me to make more sense of the journal than might otherwise be the case. But even so, what I enjoy most are the discussions of topics that exhibit the professionals’ deep involvement in their craft.

But I think what I enjoy most of all is the discovery that something as seemingly simple as generating an index turns out to be indefinitely deep. There are endless technical issues, but also fathomless questions of principle. There’s even indexer humor. For example, one of the index reviews notes that Craig Brown’s The Lost Diaries “gives references with deadpan precision (‘Greer, Germaine: condemns Queen, 13-14…condemns pineapple, 70…condemns fat, thin and medium sized women, 93…condemns kangaroos,122′).”

As I’ve said before, everything is interesting if observed at the right level of detail.

[eim][2b2k] The DSM — never entirely correct

The American Psychiatric Association has approved its new manual of diagnoses — Diagnostic and Statistical Manual of Mental Disorders — after five years of controversy [nytimes].

For example, it has removed Aspberger’s as a diagnosis, lumping it in with autism, but it has split out hoarding from the more general category of obsessive-compulsive disorder. Lumping and splitting are the two most basic activities of cataloguers and indexers. There are theoretical and practical reasons for sometimes lumping things together and sometimes splitting them, but they also characterize personalities. Some of us are lumpers, and some of us are splitters. And all of us are a bit of each at various times.

The DSM runs into the problems faced by all attempts to classify a field. Attempts to come up with a single classification for a complex domain try to impose an impossible order:

First, there is rarely (ever?) universal agreement about how to divvy up a domain. There are genuine disagreements about which principles of organization ought to be used, and how they apply. Then there are the Lumper vs. the Splitter personalities.

Second, there are political and economic motivations for dividing up the world in particular ways.

Third, taxonomies are tools. There is no one right way to divide up the world, just as there is no one way to cut a piece of plywood and no one right thing to say about the world. It depends what you’re trying to do. DSM has conflicting purposes. For one thing, it affects treatment. For example, the NY Times article notes that the change in the classification of bipolar disease “could ‘medicalize’ frequent temper tantrums,” and during the many years in which the DSM classified homosexuality as a syndrome, therapists were encouraged to treat it as a disease. But that’s not all the DSM is for. It also guides insurance payments, and it affects research.

Given this, do we need the DSM? Maybe for insurance purposes. But not as a statement of where nature’s joints are. In fact, it’s not clear to me that we even need it as a single source to define terms for common reference. After all, biologists don’t agree about how to classify species, but that science seems to be doing just fine. The Encyclopedia of Life takes a really useful approach: each species gets a page, but the site provides multiple taxonomies so that biologists don’t have to agree on how to lump and split all the forms of life on the planet.

If we do need a single diagnostic taxonomy, DSM is making progress in its methodology. It has more publicly entered the fray of argument, it has tried to respond to current thinking, and it is now going to be updated continuously, rather than every 5 years. All to the good.

But the rest of its problems are intrinsic to its very existence. We may need it for some purposes, but it is never going to be fully right…because tools are useful, not true.

(Here’s a version of the text of a submission I just made to BoingBong through their “Submitterator”)

Harvard University has today put into the public domain (CC0) full bibliographic information about virtually all the 12M works in its 73 libraries. This is (I believe) the largest and most comprehensive such contribution. The metadata, in the standard MARC21 format, is available for bulk download from Harvard. The University also provided the data to the Digital Public Library of America’s prototype platform for programmatic access via an API. The aim is to make rich data about this cultural heritage openly available to the Web ecosystem so that developers can innovate, and so that other sites can draw upon it.

This is part of Harvard’s new Open Metadata policy which is VERY COOL.

Speaking for myself (see disclosure), I think this is a big deal. Library metadata has been jammed up by licenses and fear. Not only does this make accessible a very high percentage of the most consulted library items, I hope it will help break the floodgates.

(Disclosures: 1. I work in the Harvard Library and have been a very minor player in this process. The credit goes to the Harvard Library’s leaders and the Office of Scholarly Communication, who made this happen. Also: Robin Wendler. (next day:) Also, John Palfrey who initiated this entire thing. 2. I am the interim head of the DPLA prototype platform development team. So, yeah, I’m conflicted out the wazoo on this. But my wazoo and all the rest of me is very very happy today.)

Finally, note that Harvard asks that you respect community norms, including attributing the source of the metadata as appropriate. This holds as well for the data that comes from the OCLC, which is a valuable part of this collection.