[pycsw-devel] General CSW questions

[Ian Edwards]

Thanks all, I've raised a ticket for pycsw-git backend integration to
ensure the idea is not lost.
  https://github.com/geopython/pycsw/issues/170

Also the GeoGit and django-reversion ideas are interesting for GeoNode.


On Sat, Jul 20, 2013 at 12:09 AM, Angelos Tzotsos <gcpp.kalxas at gmail.com>wrote:

> Ryan, this is a very good point.
>
> We need to look at this. Perhaps a feature ticket?
>
> Thanks,
> Angelos
>
>
> On Fri, Jul 19, 2013 at 7:43 PM, Ryan Clark <ryan.clark at azgs.az.gov>wrote:
>
>> It seems to me that for documents like metadata, straight-up Git should
>> be the version control tool of choice. Has anyone looked into trying to use
>> a Git repository as a pycsw backend? CSW providing a search interface and
>> Git as an alternative to CSW-T?
>>
>>
>> Ryan
>>
>>
>>
>>
>> On Jul 19, 2013, at 9:09 AM, Jeffrey Johnson <ortelius at gmail.com> wrote:
>>
>> > On Fri, Jul 19, 2013 at 4:06 AM, Tom Kralidis <tomkralidis at hotmail.com>
>> wrote:
>> >>> From: iedwards.pub at gmail.com
>> >>> Date: Fri, 19 Jul 2013 10:03:21 +0100
>> >>> To: pycsw-devel at lists.osgeo.org
>> >>> Subject: [pycsw-devel] General CSW questions
>> >>>
>> >>>
>> >>> Is there a forum anywhere for generic CSW questions?  I'm new to CSW
>> and pycsw and I have a few up front>questions that I've been unable to find
>> answers to before getting stuck in.
>> >>>
>> >>
>> >> fwiw, the OGC Forum exists for generic questions, see
>> http://www.ogcnetwork.net/forum/18 for CSW.
>> >>
>> >>>
>> >>> I'm trying to determine whether all transactions can/should take
>> place through the CSW (CSW-T)>interfaces.
>> >>>
>> >>
>> >> CSW-T supports the following use cases:
>> >>
>> >> - insert a full metadata record
>> >> - update metadata records
>> >> - in full or a specific part of it (queryable, XPath)
>> >> - supports bulk updates using OGC Filter syntax
>> >> - delete metadata records
>> >> - supports bulk deletes using OGC Filter syntax
>> >> - harvesting disparate metadata
>> >>
>> >>> I'm interested in:a) accessing change log (revision history) of
>> metadata records - including who made>changes, date/time of modification
>> etc.
>> >>>
>> >>
>> >> This is not supported in CSW-T per se, however some metadata
>> management environments probably support this (I'm thinking GeoNetwork).
>> >>
>> >> The GeoNode project (http://geonode.org), which is powered by pycsw,
>> is experimenting with GeoGit (http://geogit.org) for data/metadata, but
>> I'm not sure how mature this is yet.
>> >
>> > Not sure that GeoGit is a good fit for this kind of thing, might be
>> > able to be made to do this, but its primary goal is to version the
>> > data. We have looked at things like django-reversion
>> > https://github.com/etianen/django-reversion inside GeoNode to do
>> > versioning on the metadata records and I suspect it wouldnt be that
>> > difficult to implement, but we just havent done it yet.
>> >
>> >>
>> >>>
>> >>> b) high granularity of access control, e.g. anyone can edit DC fields
>> in a metadata record, but only>designated people can edit the custom
>> "approved" or "authorized" fields in the same record.
>> >>
>> >> This is out of scope for CSW-T, as authentication mechanisms are left
>> to the implementation.  Having said this, I haven't seen this level of
>> granularity out there.
>> >>
>> >>>
>> >>> c) can database migrations be managed for evolving the structure of
>> metadata records? (changes to>database schema in repeatable and consistent
>> ways).
>> >>
>> >>
>> >> Not CSW-T per se, however implementations certainly deal with this.
>>  GeoNode  includes a metadata management environment and metadata
>> migrations are made possible using South.
>> >>
>> >> Hope this helps.
>> >> _______________________________________________
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>> >> pycsw-devel at lists.osgeo.org
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>>
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>
>
>
> --
> Angelos Tzotsos
> Remote Sensing Laboratory
> National Technical University of Athens
> http://users.ntua.gr/tzotsos
>
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