ca4a54181e
- Updated WorldCatIdentifier.yaml to remove unnecessary description and ensure consistent formatting. - Enhanced WorldHeritageSite.yaml by breaking long description into multiple lines for better readability and removed unused attributes. - Simplified WritingSystem.yaml by removing redundant attributes and ensuring consistent formatting. - Cleaned up XPathScore.yaml by removing unnecessary attributes and ensuring consistent formatting. - Improved YoutubeChannel.yaml by breaking long description into multiple lines for better readability. - Enhanced YoutubeEnrichment.yaml by breaking long description into multiple lines for better readability. - Updated YoutubeVideo.yaml to break long description into multiple lines and removed legacy field name. - Refined has_or_had_affiliation.yaml by removing unnecessary comments and ensuring clarity. - Cleaned up is_or_was_retrieved_at.yaml by removing unnecessary comments and ensuring clarity. - Added rules for generic slots and avoiding rough edits in schema files to maintain structural integrity. - Introduced changes_or_changed_through.yaml to define a new slot for linking entities to change events.
65 lines
3.9 KiB
YAML
65 lines
3.9 KiB
YAML
id: https://nde.nl/ontology/hc/class/Thumbnail
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name: Thumbnail
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title: Thumbnail Media Reference
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prefixes:
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linkml: https://w3id.org/linkml/
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hc: https://nde.nl/ontology/hc/
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schema: http://schema.org/
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foaf: http://xmlns.com/foaf/0.1/
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prov: http://www.w3.org/ns/prov#
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default_prefix: hc
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imports:
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- linkml:types
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- ../slots/derives_or_derived_from
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- ../slots/has_or_had_time_interval
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- ../slots/has_or_had_url
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- ./TimeInterval
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- ./Video
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classes:
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Thumbnail:
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class_uri: schema:ImageObject
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description: "Structured thumbnail media reference.\n\n**DEFINITION**:\nA thumbnail is a reduced-size version of an image or video frame,\ntypically used for preview purposes in search results, galleries,\nand navigation interfaces.\n\n**DERIVATION FROM VIDEO** (2026-01-19 migration):\nWhen a thumbnail is extracted from a video, use:\n- `derives_or_derived_from` \u2192 Video (source video reference)\n- `has_or_had_time_interval` \u2192 TimeInterval (frame timestamp)\n\nThis replaces the deprecated `chapter_thumbnail_timestamp` float field\nwith a structured representation that supports:\n- Explicit source video reference (provenance)\n- Precise timestamp with ISO 8601 duration format\n- Multiple timestamp formats (seconds, HH:MM:SS, ISO duration)\n\n**CONSISTENCY PATTERN** (Rule 56):\nUses structured class rather than simple URL for consistency with\nother media reference patterns and extensibility:\n\n| Slot | Class | Purpose |\n|------|-------|---------|\n| has_or_had_image | Image\
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\ | Full-size images |\n| has_or_had_video | Video | Video resources |\n| has_or_had_audio | Audio | Audio resources |\n| has_or_had_thumbnail | Thumbnail | Preview images |\n\n**EXTENSIBILITY**:\nStructured class enables future metadata:\n- Image dimensions (width, height)\n- Alternative text for accessibility\n- Format (JPEG, PNG, WebP)\n- Generation timestamp\n- Source image/video reference\n\n**ONTOLOGY ALIGNMENT**:\n- **Primary**: `schema:ImageObject` (Schema.org)\n- **Close**: `foaf:Image` (FOAF)\n- **Derivation**: `prov:wasDerivedFrom` (PROV-O)\n"
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slots:
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- has_or_had_url
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- derives_or_derived_from
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- has_or_had_time_interval
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slot_usage:
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has_or_had_url:
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required: true
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examples:
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- value: https://i.ytimg.com/vi/ABC123/hq1.jpg
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derives_or_derived_from:
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range: Video
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inlined: true
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required: false
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examples:
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- value:
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has_or_had_url: https://www.youtube.com/watch?v=ABC123
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has_or_had_time_interval:
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description: "Timestamp in the source video from which this thumbnail was extracted.\nCaptures the frame time as a duration from video start.\n\n**MIGRATION NOTE**: Replaces deprecated `chapter_thumbnail_timestamp` float.\nThe float value (seconds) should be converted to ISO 8601 duration format.\n\nExample conversions:\n- 122.5 seconds \u2192 PT2M2.5S (2 minutes, 2.5 seconds)\n- 3600 seconds \u2192 PT1H (1 hour)\n"
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range: TimeInterval
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inlined: true
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required: false
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examples:
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- value:
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duration_description: Thumbnail from 2:02.5 in video
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exact_mappings:
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- foaf:Image
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annotations:
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specificity_score: '0.40'
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specificity_rationale: Medium specificity - thumbnails used broadly for media preview.
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migration_date: '2026-01-16'
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migration_updated: '2026-01-19'
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migration_rule: Rule 53 (no bespoke slots), Rule 56 (semantic consistency)
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custodian_types: "['*']"
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examples:
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- value:
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has_or_had_url: https://example.org/thumbnails/rijksmuseum-night-watch-thumb.jpg
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- value:
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has_or_had_url: https://i.ytimg.com/vi/ABC123/hq1.jpg
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derives_or_derived_from:
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has_or_had_url: https://www.youtube.com/watch?v=ABC123
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has_or_had_time_interval:
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duration_description: Frame at 2:02.5
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description: 'Video-derived thumbnail with timestamp (replaces chapter_thumbnail_timestamp: 122.5)'
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