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                    "description": "This metadata file contains important information about the dataset using the DCAT-US schema.",
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                    "format": "JSON",
                    "mediaType": "application/json",
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            "isPartOf": "https://doi.org/10.21949/1504517",
            "issued": "2013-01-01",
            "keyword": [
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                "Data files",
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            "license": "https://creativecommons.org/publicdomain/zero/1.0/legalcode",
            "modified": "2025-09-05",
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                "name": "Bureau of Transportation Statistics",
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                    "name": "Department of Transportation",
                    "subOrganizationOf": {
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                        "name": "U.S. Government"
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            },
            "spatial": "United States",
            "title": "Principal Ports 2013-Present [dataset]",
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