{
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      },
      "gnss:interval": {
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      "gnss:markerName": "VALA00ESP",
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      "@type": "PeriodOfTime",
      "endDate": {
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        "@value": "2011-11-02T23:59:30"
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        "@type": "xsd:dateTime",
        "@value": "2011-11-02T00:00:00"
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      },
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      },
      "gnss:frequency": {
        "@id": "http://purl.org/cld/freq/daily"
      },
      "gnss:obsHeader": {
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    },
    {
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      "@type": "dct:Checksum",
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}