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为了更清晰地说明JSON-LD上下文是如何将属性映射到RDF IRIs，我们可以基于提供的上下文规范，举一个完整的JSON-LD数据实例，并展示它是如何转换为RDF三元组的。
示例上下文
{"@context": {"foaf": "http://xmlns.com/foaf/0.1/", "Person": "foaf:Person","interest": "foaf:topic_interest","knows": {"@id": "foaf:knows","@type": "@id"},"birthdate": {"@id": "http://schema.org/birthDate","@type": "http://www.w3.org/2001/XMLSchema#date"},"dcterms": "http://purl.org/dc/terms/","title": "dcterms:title","creator": {"@id": "dcterms:creator","@type": "@id"},"subject_of": {"@reverse": "dcterms:subject","@type": "@id"}}
}
示例JSON-LD数据
{"@type": "Person","@id": "http://example.org/people/john","title": "Developer","creator": "http://example.org/people/jane","subject_of": "http://example.org/articles/article1","knows": "http://example.org/people/joe","birthdate": "1980-01-01"
}
映射为RDF三元组
根据上下文规范，这个JSON-LD数据可以映射为以下RDF三元组：
-
@type映射http://example.org/people/john rdf:type foaf:Person
-
title映射http://example.org/people/john dcterms:title "Developer"
-
creator映射http://example.org/people/john dcterms:creator http://example.org/people/jane
-
subject_of映射（使用@reverse）http://example.org/articles/article1 dcterms:subject http://example.org/people/john
-
knows映射http://example.org/people/john foaf:knows http://example.org/people/joe
-
birthdate映射http://example.org/people/john http://schema.org/birthDate "1980-01-01"^^http://www.w3.org/2001/XMLSchema#date
详细解释
-
@type映射到rdf:type并使用foaf:Person：<http://example.org/people/john> rdf:type foaf:Person . -
title映射到dcterms:title：<http://example.org/people/john> dcterms:title "Developer" . -
creator映射到dcterms:creator并指定类型为@id：<http://example.org/people/john> dcterms:creator <http://example.org/people/jane> . -
subject_of使用@reverse映射到dcterms:subject：<http://example.org/articles/article1> dcterms:subject <http://example.org/people/john> . -
knows映射到foaf:knows并指定类型为@id：<http://example.org/people/john> foaf:knows <http://example.org/people/joe> . -
birthdate映射到http://schema.org/birthDate并指定类型为http://www.w3.org/2001/XMLSchema#date：<http://example.org/people/john> <http://schema.org/birthDate> "1980-01-01"^^<http://www.w3.org/2001/XMLSchema#date> .
通过这些映射，可以将JSON-LD文档转换为RDF三元组，从而使数据在语义网环境中具有互操作性和可查询性。