Referenced files should be linked in the manifest

[jdsika]

  "@type": "ositrace:Quality",
  "ositrace:validationReport": {
    "@value": "https://github.com/mygroup/myproject/osi_trace_validation_report.xqar",
    "@type": "xsd:anyURI"
  },
  "ositrace:validationReportType": {
    "@value": "application/xqar",
    "@type": "xsd:string"
  }
},