Open Data APIs¶
In addition to the Drupal and CKAN-based APIs supplied with DKAN, two major open data standards are supported. Both are supplied by and configurable through the Open Data Schema Map module.
Project Open Data¶
DKAN provides full support and mapping for U.S. Project Open Data, in both its federal and non-federal variants, with a data.json endpoint. The optional Open Data Federal Extras module is needed for full federal POD compliance. See a demo here.
DCAT-AP¶
DKAN also provides endpoints and configurable field mappings for DCAT-AP, the application profile for data portals in Europe, developed by the European Commission. DCAT-AP is of course based on the Data Catalog Vocabulary (DCAT), but provides stricter definitions of catalogs, datasets, distributions and other objects. Through Open Data Schema Map, DKAN provides both a catalog endpoint (see demo) and individual RDF endoints for each dataset (see by going to any dataset on http://demo.getdkan.com/ and clicking the “RDF” link on the lefthand sidebar).
Field Comparison¶
Catalog¶
Dataset¶
| DKAN Field/Property label | DKAN Field/Property machine name | DCAT-AP property | POD property |
|---|---|---|---|
| Title | title | dct:title | title |
| Description | body | dct:description | description |
| Tags | field_tags | dcat:keyword | keyword |
| License | field_license | license | |
| Author | field_author | ||
| Spatial / Geographical Coverage Area | field_spatial_geographical_area | ||
| Spatial / Geographical Coverage Location | field_spatial_geographical_cover | dct:spatial | spatial |
| Frequency | field_frequency | dct:accrualPeriodicity | accrualPeriodicity |
| Publisher | og_group_ref | dct:publisher | publisher |
| Temporal Coverage | field_temporal_coverage | dct:temporal | temporal |
| Granularity | field_granularity | ||
| Data Dictionary | field_data_dictionary | dataDictionary | |
| Contact Name | field_contact_name | dcat:contactPoint.vcard:fn | contactPoint |
| Contact Email | field_contact_email | dcat:contactPoint.vcard:hasEmail | mbox |
| Public Access Level | field_public_access_level | dct:accessRights | accessLevel |
| Additional Info | field_additional_info | ||
| Resources | field_resources | dcat:distribution | distribution |
| Related Content | field_related_content | references | |
| Data Standard | field_conforms_to | conformsTo | |
| uuid | dct:identifier | identifier | |
| modified_date | dct:modified | modified | |
| release_date | dct:issued | issued |
The following properties are provided by the Open Data Federal Extras module and have no equivilant in DCAT. They are only relevant to U.S. federal agencies.
| DKAN Field/Property label | DKAN Field/Property machine name | POD property |
|---|---|---|
| Bureau Code | field_odfe_bureau_code | bureauCode |
| Data Quality | field_odfe_data_quality | dataQuality |
| Primary IT Investment UII | field_odfe_investment_uii | primaryITInvestmentUII |
| Program Code | field_odfe_program_code | programCode |
| System of Records | field_odfe_system_of_records | systemOfRecords |
Resource / Distribution¶
| DKAN Field/Property label | DKAN Field/Property machine name | DCAT-AP property | POD property |
|---|---|---|---|
| dcat:accessURL | accessURL | ||
| dct:conformsTo | conformsTo | ||
| describedBy | |||
| describedByType | |||
| Description | body | dct:description | description |
| Link File || Upload | field_link_remote_file || field_upload | dcat:downloadURL | downloadURL |
| Format | field_format | format | |
| field_upload:mime | dcat:mediaType | mediaType | |
| Title | title | title | dct:title |