list:list (as well as list:list:paired, list:list:list, etc...) can be
created via the API or using tools. As an example of the second - if
you had a tool that took in a dataset and split it into a list and
then mapped a list over that tool - Galaxy would produce a list:list
output from the individual jobs. (Explicit framework level support for
grouping a list into a list:list almost made it into 16.01 -
https://github.com/galaxyproject/galaxy/pull/1313 but didn't quite
make the cut, hopefully it will be in 16.04). Tools can also
explicitly produce nested collections such as lists of lists as of PR
#538 (https://github.com/galaxyproject/galaxy/pull/538).

There is however no current GUI or widget support for taking a bunch
of datasets and building a list of lists from them. There was some
discussion on this issue
https://github.com/galaxyproject/galaxy/issues/1312 about adding such
a thing. The builder for a list of pairs is pretty awesome - I imagine
a list of list builder would be a whole new and distinct challenge
unfortunately.

-John


On Wed, Jan 20, 2016 at 4:43 PM, Anmol Hemrom <anmol...@gmail.com> wrote:
>
> Hi,
>
> I was wondering if creating data collection of collection_type="list:list"
> is possible?  Because I can see only list, pair and list of pairs options
> available.
>
> Why I am asking this question is because I saw this snippet from cuffdiff
> tool which includes collection_type="list:list" as below.
>
>         <when value="CONDITION_REPLICATE_LIST">
>             <param name="conditions" title="List of Conditions"
> type="data_collection" collection_type="list:list" />
>         </when>
>
> Thanks
>
> Anmol
>
>
>
>
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