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Add EXIF properties for media objects #498

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Add EXIF properties for media objects #498

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10 changes: 10 additions & 0 deletions source/vocab/files-packages-representations.ttl
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix prov: <http://www.w3.org/ns/prov#> .
@prefix exif: <http://www.w3.org/2003/12/exif#> .
@prefix sdo: <http://schema.org/> .
@prefix dc: <http://purl.org/dc/terms/> .
@prefix bf2: <http://id.loc.gov/ontologies/bibframe/> .
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rdfs:label "height"@en, "höjd"@sv ;
sdo:domainIncludes :MediaObject ; # TODO: broaden domain later to also apply on Manifest and physical objects
owl:equivalentProperty sdo:height .

:colorSpace a owl:ObjectProperty ;
:category :pending ;
rdfs:label "color space"@en, "färgrymd"@sv ;
sdo:domainIncludes :MediaObject ;
owl:equivalentProperty exif:colorSpace .
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@niklasl niklasl May 21, 2025

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Suggested change
owl:equivalentProperty exif:colorSpace .
rdfs:subPropertyOf exif:colorSpace .


:imageBitDepth a owl:DatatypeProperty ;
owl:propertyChainAxiom (:digitalCharacteristic [ :isSelfType :ImageBitDepth ] :value) .
Comment on lines +152 to +153
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@niklasl niklasl May 21, 2025

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Given that values are extracted from image files, we can also define and use the specific (sub-)property; like:

Suggested change
:imageBitDepth a owl:DatatypeProperty ;
owl:propertyChainAxiom (:digitalCharacteristic [ :isSelfType :ImageBitDepth ] :value) .
:imageBitDepth a owl:DatatypeProperty ;
:category :pending ;
owl:propertyChainAxiom (:digitalCharacteristic [ :isSelfType :ImageBitDepth ] :value) .
:bitsPerSample a owl:DatatypeProperty ;
:category :pending ;
sdo:domainIncludes :MediaObject ;
rdfs:subPropertyOf :imageBitDepth , exif:bitsPerSample .

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@niklasl niklasl May 22, 2025

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The upside is a clear mapping to EXIF. The downside is more specificity equals more choice (which increases the risk of arbitrary differences in detail). There are ways of managing the "difference creep" (using property categories, or more validation).

2 changes: 1 addition & 1 deletion source/vocab/platform.ttl
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Expand Up @@ -161,7 +161,7 @@
:created a owl:DatatypeProperty;
:category :platform ;
rdfs:label "Skapad"@sv;
rdfs:domain :AdminMetadata;
sdo:domainIncludes :AdminMetadata, :MediaObject ;
owl:equivalentProperty bf2:creationDate ;
rdfs:subPropertyOf dc:created, sdo:dateCreated;
rdfs:range xsd:dateTime .
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