Raj, Is it similar for classifications, but the other way around? In the August 2012 dump there are 2.3 million works with LC classifications, but 10.9 million editions. Also, if you add classifications, you have to go to the Edition tab (and be in librarian mode), whereas for subjects you have to be on the work tab.
Should the classifications be moved too, or is there a reason that Editions rather than Works should be classified? Ben On 13 October 2013 22:37, raj kumar <[email protected]> wrote: > Thanks, Karen! > > I'll add one more thing about subjects which I think is quite confusing. > > OL started out having editions, but did not have works. Sometime later, work > records were added. > > At that time, edition-level subjects were migrated up to the work level. > Which means if you are looking at the web page for an edition, you won't see > any subjects listed. > > Here is where it gets confusing: when subjects were migrated up to the work > level, the subjects were not deleted from the edition records. Which means if > you get a database dump or look at the json for an edition, you will see > edition-level subject records, but these are often out of date, and should be > ignored. > > An example: > Work page shows subjects: http://openlibrary.org/works/OL1280456W/Bruegel > An edition of that work does not show subjects: > http://openlibrary.org/books/OL21409195M/Bruegel > > However, if you look at the json for the work and edition: > Work JSON shows subjects (and subject_people), as it should: > http://openlibrary.org/works/OL1280456W.json > The Edition JSON also shows (outdated) subjects: > http://openlibrary.org/books/OL21409195M.json > > Author entries work the same way. JSON for edition records show authors, but > you should ignore this field since it is often out of date. The work records > for that edition will have the most up-to-date author and subjects. > > -raj > > > On Oct 13, 2013, at 9:35 AM, Karen Coyle <[email protected]> wrote: > >> I'll add a bit of information to Ben's note, mainly because I was >> involved with the OL during its development so I sometimes have >> background information on WHY things turned out the way they did. >> Putting this in email is a lazy way for me to document some things that >> may not be known to others. >> >> Because a large number of the records in the database came from US >> library cataloging (especially from the Library of Congress), the >> concept of "genre" is often the fairly narrow one that such libraries >> recognize. (The use of this may expand in the future, as new cataloging >> rules are more open to genre information.) >> >> Where "genre" was included in the records, it was as one segment of a >> subject heading: >> >> English language -- Dictionaries >> >> This become two subject headings: English language, and Dictionaries >> >> Subjects may also cover the literary genre, like "Mysteries," but >> libraries only include this information in limited circumstances. >> >> Many records also came from Amazon, but it looks to me (and I don't >> recall exactly) that the BISAC subject headings were not included in OL. >> Those are the subject headings that bookstores use, and they are kind of >> a combination of topic ("Mathematics") and genre ("Mysteries," "Romance"). >> >> It would be great to have more genre information. We'd need to decide >> whether to add that information to subjects, or to create a separate >> data element. At the time that Open Library was being developed the >> general feeling was that there are many different concepts of genre that >> a separate data element would just confuse editors. Adding them to >> subjects may be sufficient. >> >> kc >> >> >> >> On 10/13/13 9:00 AM, Ben Companjen wrote: >>> Hi Stefan, >>> >>> Comments are inline. >>> >>> On 10 October 2013 20:51, Stefan Wurzinger >>> <[email protected]> wrote: >>>> >>>> Hi guys, >>> >>> ... and girls ;) >>> >>>> >>>> thank you again for your help, I'm really happy about it! >>>> I have another question and I hope it's the last one :) >>> >>> I hope it isn't your last question, but I do hope I can answer your >>> question. We are mostly people who are users, just like you. A couple >>> of people have (had) stronger ties with the Open Library, but the rest >>> is just interested in OL's technical stuff. >>> >>>> >>>> Is there any information about the genre of a book? >>>> I saw that there is many information about a book like author, pages, >>>> publisher, weight etc. but I didn't found the genre. Is there such an >>>> information? >>> >>> No, there is no globally defined set of genres for all books in OL. >>> However, some 1.3 million editions (of ~25 million in total) have a >>> "genres" field, which is displayed, but cannot be edited via the web >>> interface. I think "novel", "dictionary" are values used in this >>> field. >>> >>> Possible more useful, although different from what you probably call >>> "genre", are the classifications and subjects. Since a lot of data >>> came from libraries, the books may have a classification from the >>> Library of Congress or Dewey Decimal Classification scheme. These >>> schemes (see [1] and [2]) have classes for reference works, literature >>> and other types of works by general topic. >>> Subject in OL are freeform: next to the topics of works >>> (classifications are - strangely enough - assigned to Ediitions, >>> subjects to Works), these are used to indicate e.g. availability for >>> loan. There are works with subjects "dictionary" or "novel", although >>> they are few. >>> >>> Did this help? :) >>> >>> Regards, >>> >>> Ben >>> >>> [1] https://en.wikipedia.org/wiki/Library_of_Congress_Classification >>> [2] https://en.wikipedia.org/wiki/Dewey_Decimal_Classification >>>> >>>> Best regards and thanks in advance >>>> Stefan Wurzinger >>>> >>>> _______________________________________________ >>>> Ol-tech mailing list >>>> [email protected] >>>> http://mail.archive.org/cgi-bin/mailman/listinfo/ol-tech >>>> Archives: http://www.mail-archive.com/[email protected]/ >>>> To unsubscribe from this mailing list, send email to >>>> [email protected] >>> _______________________________________________ >>> Ol-tech mailing list >>> [email protected] >>> http://mail.archive.org/cgi-bin/mailman/listinfo/ol-tech >>> Archives: http://www.mail-archive.com/[email protected]/ >>> To unsubscribe from this mailing list, send email to >>> [email protected] >>> >> >> -- >> Karen Coyle >> [email protected] http://kcoyle.net >> m: 1-510-435-8234 >> skype: kcoylenet >> _______________________________________________ >> Ol-tech mailing list >> [email protected] >> http://mail.archive.org/cgi-bin/mailman/listinfo/ol-tech >> Archives: http://www.mail-archive.com/[email protected]/ >> To unsubscribe from this mailing list, send email to >> [email protected] > > _______________________________________________ > Ol-tech mailing list > [email protected] > http://mail.archive.org/cgi-bin/mailman/listinfo/ol-tech > Archives: http://www.mail-archive.com/[email protected]/ > To unsubscribe from this mailing list, send email to > [email protected] _______________________________________________ Ol-tech mailing list [email protected] http://mail.archive.org/cgi-bin/mailman/listinfo/ol-tech Archives: http://www.mail-archive.com/[email protected]/ To unsubscribe from this mailing list, send email to [email protected]
