"rel": {
        "tags": {
            "a": {"description": "Relationship between the document containing the hyperlink and the destination resource","value": "Set of space-separated tokens*"},
            "area": {"description": "Relationship between the document containing the hyperlink and the destination resource","value": "Set of space-separated tokens*"},
            "link": {"description": "Relationship between the document containing the hyperlink and the destination resource","value": "Set of space-separated tokens*"}