Adaption of the data portals at City of Stockholm to DCAT-AP

Purpose and goal

The goal of the project was to provide the metadata from the data portal, which is managed in accordance with ISO 19115 / ISO 19139, according DCAT AP. Metadata should be possible to be harvested. To solve this a mapping made between ISO19115 and DCAT-AP was needed and to analyze whether enough information is available in the existing catalogue to fulfill the requirements of the mapping. The goal was also to produce input forms that both solves the needs of DCAT-AP and ISO 19115 / ISO 19139

Results and expected effects

The current catalogue that is used in the data portal has been expanded with the interface and mapping rules so that Öppnadata.se can harvest the directory. There are some elements in DCAT-AP that was not possible to create automatically. This is partly semantic differences between ISO 19115 and DCAT AP partly missing metadata in the existing directory. In order to meet requirements of DCAT AP some metadata had to be added. One important result has been an increased understanding of DCAT AP.

Approach and implementation

The project was implemented in three main parts. Development of input-forms integrated in the data catalogue. These forms can be configured so that the metadata can be created for different resources in either ISO 19139 or DCAT AP. Mapping of existing metadata to DCAT AP. The provision of metadata through various service interfaces. Main interface that we see as key is access to the entire contents of the catalog in a merged RDF and by tagging of HTML-views via RDF / A