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## SPARQL
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### Endpoint
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http://lod.onb.ac.at/sparql/akon
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#### number of titles
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```
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PREFIX dc: <http://purl.org/dc/elements/1.1/>
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SELECT (count(DISTINCT ?title) as ?number_of_titles)
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WHERE {
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[] dc:title ?title .
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}
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```
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#### number of postcards
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```
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PREFIX edm: <http://www.europeana.eu/schemas/edm/>
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SELECT (count(?postcards) as ?number_of)
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WHERE {
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?postcards edm:isShownAt [] .
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}
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```
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## Core EDM resources
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### edm:ProvidedCHO
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|Properties|Value|
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|----------|------------|
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|**dc:date**|date of the postcard, if available a range|
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|**dc:identifier**|identifier of the postcard, used in http://data.onb.ac.at/AKON/{id} and IIIF requests|
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|**dc:type**|postcard|
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|**dc:publisher**||
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|**dc:creator**|photographer|
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|**dcterms:spatial**|city if it exists|
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|**dc:title**|title as shown on http://akon.onb.ac.at/|
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|**dc:description**|city > building > mountain > water_body > other|
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|**edm:type**|always 'IMAGE'|
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|**edm:rights**|http://rightsstatements.org/vocab/CNE/1.0/|
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### ore:Aggregation
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|Properties|Value|
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|----------|------------|
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|**edm:isShownAt**|link to the postcard on the AKON Homepage|
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|**edm:provider**|always 'Austrian National Library'|
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|**edm:isShownBy**|links to the postcard and is described in edm:WebResource|
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### edm:WebResource for digital representations
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#### postcard
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|Properties|Value|
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|------------|------------|
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|**sioc:has_service**|connecting the WebResource to a resource of type sioc:Service|
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|**dcterms:isReferencedBy**|connects to a IIIF manifest URI|
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## Classes for contextual resources
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### sioc:Service
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|Properties|Value|
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|------------|------------|
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|**dcterms:conformsTo**|indicating that the WebService conforms to the IIIF profile|
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|**doap:implements**|indicating that the WebService implements the IIIF protocol| |