{
  "@context": {
    "Book":         "http://example.org/vocab#Book",
    "Chapter":      "http://example.org/vocab#Chapter",
    "contains":     {"@id": "http://example.org/vocab#contains", "@type": "@id"},
    "creator":      "http://purl.org/dc/terms/creator",
    "description":  "http://purl.org/dc/terms/description",
    "Library":      "http://example.org/vocab#Library",
    "title":        "http://purl.org/dc/terms/title"
  }
}