CSW: Unterschied zwischen den Versionen
Stefan (Diskussion | Beiträge) |
Stefan (Diskussion | Beiträge) (→Core catalogue schema) |
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xmlns:iso19115TopicCategory="http://www.isotc211.org/" | xmlns:iso19115TopicCategory="http://www.isotc211.org/" | ||
xmlns:dcmiBox="http://dublincore.org/documents/2000/07/11/dcmi-box/"> | xmlns:dcmiBox="http://dublincore.org/documents/2000/07/11/dcmi-box/"> | ||
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<dc:creator>U.S. Geological Survey</dc:creator> | <dc:creator>U.S. Geological Survey</dc:creator> | ||
<dc:contributor>State of Texas</dc:contributor> | <dc:contributor>State of Texas</dc:contributor> |
Version vom 4. Oktober 2007, 02:34 Uhr
'Catalog Services for the Web' from OGC.
See also OAI-PMH and especially HowTo OAI-PMH for harvesting geo-metadata.
Specifications and software:
- OGC-CSW 2.0.1, OGC Catalogue Services Specification, version 2.0.1 OGC 04-021r3.
- GeoNetwork opensource v2.1 (GN) the Reference Implementation of CSW.
The following OGC specifications are also relevant for CSW (!):
- OpenGIS Web Services Common Specification, version 1.0.0 OGC 05-008c1
- Filter Encoding Implementation Specification, version 1.1.0 OGC 04-095
- Geographic information -- Geography Markup Language OGC 03-105r1
Remarks
CSW is not the only catalog specification from OGC. There is a competing specification called 'ebRIM Profile' (!!!) :-O.
Harvesting is not yet implemented in GeoNetwork (GN) - the reference implementation (!!!). Question from the GeoNetwork-devel mailing list: "Why the CSW harvesting compliant with the OGC spec. is not implemented in GN 2.1". Answer (26.09.2007 14:07): " The CSW harvesting operation has a not well defined sematics and is not flexible enough to allow a good harvesting. The specs are continually changing making its usage useless. I'm finishing to implement the OAI-PMH harvesting protocol and, IMHO, it outperforms CSW harvesting on all aspects.".
Core catalogue schema
The following is an example of a (‘qualified’ core metadata set of the Dublin Core Metadata Initiative (Source: OGC 04-021r3):
<?xml version="1.0" encoding="UTF-8"?> <cat:Record xmlns:cat="http://www.opengis.net/cat" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dct="http://purl.org/dc/terms/" xmlns:csw="http://www.opengis.net/cat/csw" xmlns:iso19115TopicCategory="http://www.isotc211.org/" xmlns:dcmiBox="http://dublincore.org/documents/2000/07/11/dcmi-box/"> <dc:creator>U.S. Geological Survey</dc:creator> <dc:contributor>State of Texas</dc:contributor> <dc:publisher>U.S. Geological Survey</dc:publisher> <dc:subject>Elevation, Hypsography, and Contours</dc:subject> <iso19115TopicCategory>Elevation</iso19115TopicCategory> <dct:abstract>Elevation data collected for the National Elevation Dataset (NED) based on 30m horizontal and 15m vertical accuracy. </dct:abstract> <dc:identifier>f264-77d2-09ce-aa39-f0f0</dc:identifier> <dc:relation>g</dc:relation> <dc:source>h</dc:source> <dc:rights>i</dc:rights> <dc:format>j</dc:format> <dc:type>Service</dc:type> <dc:title>National Elevation Mapping Service for Texas</dc:title> <dct:modified>2004-03-01</dct:modified> <dct:spatial> <Box projection="EPSG:4326" name="Geographic"> <northlimit>34.353</northlimit> <eastlimit>-96.223</eastlimit> <southlimit>28.229</southlimit> <westlimit>-108.44</westlimit> </Box> </dct:spatial> <dc:language>en</dc:language> </cat:Record>