[open-bibliography] Searching multiple tags on CKAN (was: Linked Data at the Spanish National Library)

[Tom Morris]

On Tue, Feb 7, 2012 at 5:44 PM, Tom Morris <tfmorris at gmail.com> wrote:
> On Thu, Feb 2, 2012 at 2:48 PM, Tom Morris <tfmorris at gmail.com> wrote:
>
>> On a related note, how do I get CKAN/TheDataHub to give me a list of
>> all openly licensed bibliographic data dumps?  Is there a way to
>> select multiple tags to filter on at the same time?
>
> I found a partial answer to this.  Clicking on a tag behaves
> differently depending on your context.  In the context of a single
> dataset's entry (e.g. http://thedatahub.org/dataset/datos-bne-es),
> clicking a tag shows all the entries for that tag, but doesn't give
> you a way to combine that tag with any other.
>
> However, if you start at the search panel, clicking a tag adds it to
> the active filters and you can click as many tags as you want, adding
> and removing them.  You can do a similar thing with groups and combine
> them with tags.
>
> The thing I haven't figured out yet, is how to facet on license or
> license category (open/not open).  The closest I've gotten so far is
>
>    http://thedatahub.org/dataset?groups=publicdomain&q=&groups=bibliographic
> or
>    http://thedatahub.org/dataset?groups=publicdomain&q=&tags=bibliographic
>
> which return 2 and 1 results, respectively, so clearly that's not
> right.  I tried several different variations of license=cc0,
> licenses=cc-zero, etc without luck.
>
> Is there a way to constrain a search by license?

As a stop gap, I've added 'cc0' and 'publicdomain' tags to datasets
that I was able to locate by clicking around.  Feel free to add these
tags to other data sets I've missed.

The following two queries will find some of the more liberally
licensed bibliographic data sets:

http://thedatahub.org/dataset?tags=bibliographic&tags=cc0
http://thedatahub.org/dataset?tags=bibliographic&tags=publicdomain

Tom