While the following were informed by conversations and presentations at LAWDI, they should be considered my opinions only, and I welcome any (polite!) discussion of why my ideas are wrong-headed in comments.
So, you’re a scholar putting up information online, and you don’t have the time or IT chops to start learning how to implement RDFa or learn a specialized linked open data vocabulary. The following are some ideas of things you can do that are linked open data friendly, with an emphasis on providing links to stable, authoritative, easy to use URLs. This post covers bibliographic items (secondary scholarship).
I want to emphasize that doing all this linking is work; it takes time. I’ve been trying to link more thoroughly in my blog posts about LAWDI, and it does add to the time burden of writing blog posts. I urge readers to strive to include more (good-quality) links in the things they post online, but please don’t feel guilty if you can’t do it all. Do what you can; every bit is a piece toward our common goals.
- Link to a WorldCat record using the OCLC number. Permalink URLS are linkable from records and can be created using the format http://www.worldcat.org/oclc/37663433 .
WorldCat is my top choice because 1) it welcomes links, 2) it’s the largest and most international open linkable library catalog. Note: sometimes if you look a book up by title you’ll find multiple OCLC records with multiple OCLC numbers, even though you’re looking at the same book, not even different editions. OCLC and its members are probably working to tidy this sort of thing and merge (or at least cross-reference) duplicate records. For now, pick the one that has the largest number of libraries showing in the list in your home/target country (there will often be one US record and one European record, for example.)
- Link to the US Library of Congress using an LCCN (Library of Congress Call Number). Permalink URLS are shown in records and can be created using the format http://lccn.loc.gov/97040652 (useful, since many books have the LCCN in print on the inside.)
Using the Library of Congress is a fine choice; it’s my second choice because it is US-centric (while WorldCat is working on becoming more international) and the Library of Congress records don’t have the enhancements that WorldCat records do (ability to display holdings in libraries near you, ability to provide a link to online booksellers, etc.)
- I would not bother linking to, for example, Amazon using an ISBN. WorldCat links using OCLC are more useful in my opinion, and as easy to create.
- Including the ISBN in a citation can be useful; there are some great browser plug-ins that can identify ISBNs in web pages and link users to libraries or online booksellers (for example, LibX or Book Burro).
- If a book is available in an open-access digital edition, by all means include a link to that, preferably in addition to a link to a WorldCat record for the print edition. For open-access digital books you have two strong choices, neither the clear winner yet in my opinion.
- Link to the Open Library record. URLs look like this: http://openlibrary.org/books/OL6907393M
Open Library is the more linked data friendly solution; each record can be downloaded in RDF and JSON. Records also include linked OCLC numbers and LCCNs. The full-text books can be downloaded in a bunch of different formats, from .pdf to MOBI, and also also readable online. Open Library is part of the Internet Archive, and is a “born-open” project. They currently only have about 1 million open-access books, though, and their records aren’t as scholar-friendly – they don’t have all the features of library catalog records (though they are based on them.)
- Link to the Hathi Trust record. URLs look like this: http://catalog.hathitrust.org/Record/001220795
Hathi Trust’s records have library-provided bibliographic data and they have a large collection (3 million plus) of open-access volumes (as well as many more digital volumes not open-access; availability of formats can also be an issue). They are backed by a bunch of big academic libraries and are likely to stick around. They have an API, but are not as linked-data friendly as Open Library.
- I would not bother linking to a Google Books record unless you can’t find a match at either of the previous places. Google Books has great content, but their metadata is lacking, and they are a for-profit company who cannot guarantee a future commitment to free open-access products.
- For print-only book chapters, right now you’d do best to link to the whole book.
- Ditto for book chapters available in full-text digitally, unless you can track down .pdfs at the author’s web site or academia.edu, for example.
- Link to the DOI of the article – a long unique number appended in even print citations – using the format http://dx.doi.org/10.1177/1469605309338428 . Participating publishers have committed to maintaining access to articles via DOIs in perpetuity, even as their online platforms may change. (Remember, though, a lot of the articles are available by subscription only; many who follow the link will get an abstract but not full-text if their institution does not subscribe.)
- Available digitally but doesn’t have a DOI? Look for a stable URL or permalink at the page with the article citation. Jstor does a good job with these (http://www.jstor.org/stable/3182036) but so do many other large commercial article databases.
- Available digitally but not directly linkable? (This might be the case with an article published in a 19th century journal that has been digitized by the volume, but without the individual articles indexed, or an online-only journal with poor linkability.) Link to the record for the journal in a repository like Hathi Trust or Open Library (above), or to the home page of the online journal, if articles cannot be directly linked.
- Print-only? (Lots of journal articles still are, especially older, smaller, or foreign ones). Link to the WorldCat record for the whole journal, using the OCLC number or ISSN if there is one: http://www.worldcat.org/oclc/18999240 .
Questions? Quibbles? Cases I missed? Ask in comments.
Previous posts here on LAWDI:
Collection of blog posts and other resources from LAWDI: