DCLite4G

DCLite4G is an effort to
 * establish a common information model with mappings to well known formats for geospatial metadata
 * provide a vocabulary/recommendations for spatial extensions to Dublin Core
 * support simple interfaces for collecting and querying geospatial metadata

Mailing List
Feel welcome to join the discussion and development mailing list:
 * http://lists.eogeo.org/mailman/listinfo/dclite4g

TODO

 * extract more of the specifics from Geodata Metadata Requirements. (This has changed a lot from the original version in the history & current version which has data sets differentiated from data sources, which may be files or databases or services)
 * update docs on Geodata Metadata Model
 * draw some UML to appease people?

= Information Model =

OAI-PMH
The Harvesting Protocol (version 2.0) specification together with Implementation Guidelines

Following are 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 bounding box encoding as defined in http://georss.org/simple.html#Box
 * 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.

Additional bounding box query property for ListRecords.