For a data set that are available on the web, one can write a function 
to download it.  This can be done either because of license issues or 
because the database changes, and you might like to get the latest 
version.  One example is fda::readHMD.  The Ecfun package contains many 
other examples.  The latter includes readCookPVI, 
readFinancialCrisisFiles, readNIPA, readUShouse, readUSsenate, 
readUSstateAbbreviations, and testURLs.


       Hope this helps.
       Spencer


On 7/22/2014 12:46 AM, Gionata Bocci wrote:
> Thank you all very much for your (extremely) prompt reply.
> If datasets' authors won't agree on releasing their data under GPL, I'll
> follow G. Grothendieck suggestion and build a ad-hoc data-package.
> Thanks,
>
> Gionata.
>
>
>
> 2014-07-21 20:04 GMT+02:00 Gábor Csárdi <csardi.gabor@gmail.com>:
>
>> On Mon, Jul 21, 2014 at 1:56 PM, Gabor Grothendieck
>> <ggrothendieck@gmail.com> wrote:
>>> On Mon, Jul 21, 2014 at 12:54 PM, Gábor Csárdi <csardi.gabor@gmail.com>
>> wrote:
>>>> In practice, CRAN maintainers do not allow multiple licenses for parts
>>>> of the same package. At least they did not for my package a couple of
>>>> months ago.
>>>>
>>> If that is the case then you could put your data files in a separate
>>> package from the code with one depending on the other.
>> Yes, and sometimes this even makes sense, as the data does not change
>> often.
>>
>> This was, however, a package with several data sets, accompanying a
>> book. So this would have been quite cumbersome.
>>
>> Gabor
>>
>>> --
>>> Statistics & Software Consulting
>>> GKX Group, GKX Associates Inc.
>>> tel: 1-877-GKX-GROUP
>>> email: ggrothendieck at gmail.com
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>
>
>
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