JSON-LD上下文将属性映射到RDF IRIs示例

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：

1. @type 映射

   • http://example.org/people/john rdf:type foaf:Person

2. title 映射

   • http://example.org/people/john dcterms:title "Developer"

3. creator 映射

   • http://example.org/people/john dcterms:creator http://example.org/people/jane

4. subject_of 映射（使用 @reverse）

   • http://example.org/articles/article1 dcterms:subject http://example.org/people/john

5. knows 映射

   • http://example.org/people/john foaf:knows http://example.org/people/joe

6. 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。