[pycsw-devel] CSW Harvesting using APISO possible?

[Michael Schulz]

Hi Tom,

sure that would be an option. Although it's not just about the outputSchema
returned from the getrecords request it's also about the typename to query.
I don't think we can put both decisions in one config option, can we?

There are actually two things coming together.
- First, which typename to query. The specs (for AP ISO) say that the
GetRecords operation must accept one of csw:Record or gmd:MD_Metadata.
Which one should be used could be decided from the capabilities.
- Second, which outputschema should be returned? This would be the part
that could be configured via the parameter you suggested.

Another option could actually be the "faulty" way I tried it in the
beginning. I just reread the CSW ISO specification on the harvest topic,
but it didn't help very much in that respect. I guess it wouldn't be wrong
to specifiy the outputschema as the resourcetype in the harvest request.
What do you think?

Cheers, Michael




2014-02-20 20:02 GMT+01:00 Tom Kralidis <tomkralidis at gmail.com>:

>
>
> Sent from my iPhone
>
> On Feb 20, 2014, at 10:24, Michael Schulz <mandschulz at googlemail.com>
> wrote:
>
> Hi Tom,
>
> thanks for your answer. In the AP ISO CSW profile however it is specified,
> that one of csw.Record OR gmd:MD_Metadata must be supported (csw:Record
> being the default).
>
> https://github.com/geopython/pycsw/issues/223
>
> Do you think it would be enough to check the servers capabilities which
> typename(s) is/are supported and then choose the appropriate parser in
> paerse_csw?
>
>
> See
> https://github.com/geopython/pycsw/issues/105 for more info. I you want
> to harvest ISO metadata it is pertinent to specify the outputschema for ISO.
>
> For pycsw maybe we can add a setting (manager.csw_harvest_iso:true) which
> makes the harvest ask for ISO metadata instead of the default Dublin Core.
> Would this work for you?
>
>
> Cheers, Michael
>
>
> 2014-02-20 15:29 GMT+01:00 Tom Kralidis <tomkralidis at gmail.com>:
>
>> On Thu, Feb 20, 2014 at 7:45 AM, Michael Schulz
>> <mandschulz at googlemail.com> wrote:
>> > Hi,
>> >
>> > ok, I think I understood my mistake... ResourceType needs to be left as
>> csw.
>> > The reason is, that the CSW I'm querying only supports gmd:MD_Metadata
>> as
>> > typename and not csw:Record.
>>
>> Do you mean outputschema and not typename? A valid CSW MUST support
>> typname csw:Record typename and outputschema
>> http://www.opengis.net/cat/csw/2.0.2 as baseline.
>>
>> >. But I think only csw:Record is requested from
>> > pycsw...
>> >
>>
>> Good catch.  You are right, pycsw always does CSW harvesting using the
>> Dublin Core output, not ISO.  The initial implementation of CSW
>> harvesting was focused on the core CSW baseline requirement of Dublin
>> Core, which every CSW is required to implement/support.
>>
>> Having said this, sounds like a great idea to support CSW harvesting
>> of ISO metadata.  We could probably add a configuration value which
>> allows the pycsw admin to specify how CSW harvesting can be done.
>>
>> Can you file an enhancement ticket at
>> https://github.com/geopython/pycsw/issues/new ?
>>
>> Thanks
>>
>> ..Tom
>>
>>
>> > Cheers, Michael
>> >
>> >
>> >
>> >
>> > 2014-02-20 13:15 GMT+01:00 Michael Schulz <mandschulz at googlemail.com>:
>> >>
>> >> Hi,
>> >>
>> >> I was wondering whether it should be in principle possible to harvest a
>> >> remote CSW returning APISO metadata records? No problem in loading
>> them from
>> >> a file, but I didn't succeed in harvesting a CSW endpoint, using
>> something
>> >> like this (following the example in the tester, using another local csw
>> >> instance):
>> >>
>> >> <Harvest xmlns="http://www.opengis.net/cat/csw/2.0.2"
>> >> xmlns:ogc="http://www.opengis.net/ogc"
>> >> xmlns:gmd="http://www.isotc211.org/2005/gmd"
>> >> xmlns:ows="http://www.opengis.net/ows"
>> >> xmlns:xsd="http://www.w3.org/2001/XMLSchema"
>> >> xmlns:dc="http://purl.org/dc/elements/1.1/"
>> >> xmlns:dct="http://purl.org/dc/terms/" xmlns:gml="
>> http://www.opengis.net/gml"
>> >> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>> >> xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2
>> >> http://schemas.opengis.net/csw/2.0.2/CSW-publication.xsd"
>> service="CSW"
>> >> version="2.0.2">
>> >>
>> >> <Source>
>> http://mylocal_csw_instance?request=GetCapabilities&service=CSW</Source>
>> >> <ResourceType>http://www.isotc211.org/schemas/2005/gmd/</ResourceType>
>> >> <ResourceFormat>application/xml</ResourceFormat>
>> >> </Harvest>
>> >>
>> >> And if I'm not wrong, then it won't parse the metadata records, because
>> >> this case is not implemented in metadata.parse_record. If that's the
>> case,
>> >> then it should be just about adding a new condition to check for gmd
>> >> resourceType and use parse_iso?
>> >>
>> >> Cheers, Michael
>> >>
>>
>
>
>
> --
> -----------------------------------------------------------
> Michael Schulz
>
> Bahnhofstr. 62
> D-63477 Maintal
>
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>


-- 
-----------------------------------------------------------
Michael Schulz

Bahnhofstr. 62
D-63477 Maintal
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