[pycsw-devel] General CSW questions

[Angelos Tzotsos]

Hi Ian,
Thank you for the ticket, this is a good idea for tracking changes of 
metadata.

Best,
Angelos

On 07/23/2013 10:54 AM, Ian Edwards wrote:
> 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.
>>>>> _______________________________________________
>>>>> pycsw-devel mailing list
>>>>> pycsw-devel at lists.osgeo.org
>>>>> http://lists.osgeo.org/mailman/listinfo/pycsw-devel
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>>
>>
>> --
>> Angelos Tzotsos
>> Remote Sensing Laboratory
>> National Technical University of Athens
>> http://users.ntua.gr/tzotsos
>>
>> _______________________________________________
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>> pycsw-devel at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/pycsw-devel
>>
>>


-- 
Angelos Tzotsos
Remote Sensing Laboratory
National Technical University of Athens
http://users.ntua.gr/tzotsos