Stuart,

If I understand your question correctly, I *think* Talis Aspire Reading
Lists would fall under category 2, e.g.

https://victoria.rl.talis.com/items/43F39EFD-491F-CFED-7C8A-4BEA740DB0FE.html?referrer=%2Flists%2F9CD9FC84-3CB4-A08C-D473-3D85A705A24C.html%23item-43F39EFD-491F-CFED-7C8A-4BEA740DB0FE

or

https://victoria.rl.talis.com/items/B603CCAC-548A-58DA-5534-F55181456A65.html?referrer=%2Flists%2FCB22E031-B3B9-AD2C-CBC6-9D9C471D0F9E.html%23item-B603CCAC-548A-58DA-5534-F55181456A65

The (I think) relevant bit here is that any list owner could bookmark any
article from anywhere (regardless if it's something the institution
subscribes to) and TARL would create an openurl based on the metadata
available from the bookmarking process (which, in *some* cases could be
spotty).  And, as you note, may be freely available and not managed in your
knowledgebase.

Theoretically, RefWorks, Mendeley, Zotero, etc. could be other possible
examples of your category 2, but they'd be harder find public examples for.

Outside of these (and maybe even outside of Google Scholar alone) I think
your tail, however long, will be statistically insignificant for any
individual source.

-Ross.

On Wed, Nov 30, 2016 at 4:39 PM Stuart A. Yeates <[log in to unmask]> wrote:

> I'm currently trying to systematise our use of EZproxy for
> non-purchased/licensed resources.
>
> There are two classes of non-purchased/licensed resources that I'm aware
> of.
>
> The first is the class of PURL-like: services http://doi.org/,
> http://purl.org/, http://handle.net/ and so forth which are used to link
> to
> purchased/licensed resources.Working out when we need to add these is
> pretty straight-forward: navigating from our search services to a resource
> fails with an authentication message and someone notices, complains and we
> fix things.
>
> The second class are services such as https://scholar.google.co.nz/ which,
> while we don't have a formal relationship with them, leverage our openurl
> resolver to enable users to access more content than the normally would.
>
> My question is whether any one knows of any services in the second class
> other than google scholar? The tricky thing here is that they're likely to
> work as apparently expected but not offer as much access as they might.
>
> Thoughts?
>
> Microsoft Academic Search appears not to do openurl, see
> https://social.microsoft.com/Forums/windows/en-US/2d1b5774-b5f0-42d8-a020-
> d8b89d5dadbc/microsoft-academic-search-and-openurl-compliance
> <https://social.microsoft.com/Forums/windows/en-US/2d1b5774-b5f0-42d8-a020-d8b89d5dadbc/microsoft-academic-search-and-openurl-compliance>
>
> cheers
> stuart
>
> --
> ...let us be heard from red core to black sky
>