HowTo OAI-PMH: Unterschied zwischen den Versionen
Aus Geoinformation HSR
| Zeile 7: | Zeile 7: | ||
* '''5. Extend it''' eventually with specific metadata models and respective XML formats. | * '''5. Extend it''' eventually with specific metadata models and respective XML formats. | ||
| − | + | Following are more specific guidelines for a minimal OAI-PMH implementation of a so called 'data provider' using only the mandatory 'unqualified' Dublin Core (DC): | |
| − | * ... | + | |
| + | * Only three operations (verbs) are needed: Identify, ListMetadataFormats and ListRecords. | ||
| + | * Following operations are not required (initially): ListIdentifiers, ListSets, GetRecord. | ||
| + | * No incremental harvesting (resumption process for ListXxx operations with more than 1000 records) | ||
| + | * No compression as defined in the OAI-PMH spec. (compression at lower http level still possible) | ||
| + | * Date granularity may be 'day' not seconds (YYYY-MM-DD) | ||
| + | * Keeping track of deleted record may not be supported (deletedRecord=no) | ||
| + | * Mandatory DC supported as data model is sufficient for a start but with specific semantics (e.g. coverage, relation) (see also example below): | ||
| + | ** dc:description contains dct:abstract | ||
| + | ** dc:coverage contains a lat/lon bounding box encoding as defined in http://georss.org/simple.html#Box (minx, miny, maxx, maxy: dc:coverage example for a Swiss Canton: 7.30676 47.0585 8.10371 47.5371) | ||
| + | ** dc:date means in fact dct:modified | ||
| + | ** dc:relation is filled in with dclite4g:onLineSrc. If dc:type='service' dct:hasPart can be derived from GetCapabilities. | ||
| + | |||
| + | OAI implementations: | ||
| + | * [[Geometa-Editor]] | ||
| + | * GeoShop, Fa. infoGrips GmbH, Zurich, Switzerland (C, Java) | ||
| + | * GeoNetwork, open source, rel. 2.2 (GPL, Java) | ||
[[Kategorie:HowTo]] [[Kategorie:Metadaten]] | [[Kategorie:HowTo]] [[Kategorie:Metadaten]] | ||
Version vom 10. Juni 2007, 11:06 Uhr
HowTo implement OAI-PMH (5 steps):
- 1. Join the community: Register to the 'OAI Implementers list' at the official OAI Homepage
- 2. Read the spec.: The Harvesting Protocol (version 2.0) specification together with Implementation Guidelines
- 3. Look at existing tools, rated above.
- 4. Implement DC model and test it: The official OAI Repository Explorer. Most important operations (called 'verbs') are Identify, ListMetadataFormats, ListRecords and GetRecord, perhaps initially without incremental harvesting (resumption process).
- 5. Extend it eventually with specific metadata models and respective XML formats.
Following are more specific guidelines for a minimal OAI-PMH implementation of a so called 'data provider' using only the mandatory 'unqualified' Dublin Core (DC):
- Only three operations (verbs) are needed: Identify, ListMetadataFormats and ListRecords.
- Following operations are not required (initially): ListIdentifiers, ListSets, GetRecord.
- No incremental harvesting (resumption process for ListXxx operations with more than 1000 records)
- No compression as defined in the OAI-PMH spec. (compression at lower http level still possible)
- Date granularity may be 'day' not seconds (YYYY-MM-DD)
- Keeping track of deleted record may not be supported (deletedRecord=no)
- Mandatory DC supported as data model is sufficient for a start but with specific semantics (e.g. coverage, relation) (see also example below):
- dc:description contains dct:abstract
- dc:coverage contains a lat/lon bounding box encoding as defined in http://georss.org/simple.html#Box (minx, miny, maxx, maxy: dc:coverage example for a Swiss Canton: 7.30676 47.0585 8.10371 47.5371)
- dc:date means in fact dct:modified
- dc:relation is filled in with dclite4g:onLineSrc. If dc:type='service' dct:hasPart can be derived from GetCapabilities.
OAI implementations:
- Geometa-Editor
- GeoShop, Fa. infoGrips GmbH, Zurich, Switzerland (C, Java)
- GeoNetwork, open source, rel. 2.2 (GPL, Java)
