{
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      "spec": "EPUB 3.3",
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      "url": "https://www.w3.org/TR/epub-33/#sec-container-metainf-rights.xml"
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    "snapshot": {
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      "text": "Digital signatures file (signatures.xml)",
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    "snapshot": {
      "number": "4.3",
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      "url": "https://www.w3.org/TR/epub-33/#sec-container-zip"
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    }
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      "text": "Relationship to the EPUB content document",
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    },
    "snapshot": {
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      "spec": "EPUB 3.3",
      "text": "Relationship to the EPUB content document",
      "url": "https://www.w3.org/TR/epub-33/#sec-docs-relations"
    }
  },
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      "text": "Structural semantics in overlays",
      "url": "https://w3c.github.io/epub-specs/epub33/core/#sec-docs-structural-semantic"
    },
    "snapshot": {
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      "spec": "EPUB 3.3",
      "text": "Structural semantics in overlays",
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    }
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    },
    "snapshot": {
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      "text": "duration",
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    },
    "snapshot": {
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}