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

[Tom Morris]

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?

Tom