credential_sample.json

{
  "@context": {
    "schema": "http://schema.org/",
    "dc": "http://purl.org/dc/elements/1.1/",
    "dct": "http://dublincore.org/terms/",
    "rdf": "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
    "rdfs": "http://www.w3.org/2000/01/rdf-schema#",
    "ctdl": "[CTI Namespace Not Determined Yet]"
  },
  "@type": "cti:Credential",
  "cti:credentialLevel": [
    "Postsecondary (Less than 1 year)"
  ],
  "cti:credentialType": [
    "Job Skills Certificate"
  ],
  "cti:dateEffective": "",
  "cti:earnings": [],
  "cti:employmentOutcome": [],
  "cti:estimatedTimeToEarn": [],
  "cti:holders": [],
  "cti:industryCategory": [
    {
      "@type": "schema:Enumeration",
      "schema:name": "NAICS",
      "schema:url": "http://www.credreg.net/naics",
      "unknown:items": []
    }
  ],
  "cti:industryCategory_Flat": [],
  "cti:isRecommendedFor": [],
  "cti:isRequiredFor": [],
  "cti:jurisdiction": [],
  "cti:occupationCategory": [
    {
      "@type": "schema:Enumeration",
      "schema:name": "ONET Occupation Codes",
      "unknown:items": []
    }
  ],
  "cti:purpose": [
    "Mid-career level within an occupation"
  ],
  "cti:recommends": [],
  "cti:removal": [],
  "cti:renewal": [],
  "cti:requires": [
    {
      "@type": "cti:ConditionProfile",
      "cti:applicableAudienceType": [
        "Individuals"
      ],
      "cti:credentialType": [
        "Job Skills Certificate"
      ],
      "cti:experience": "Course registration\nValid identification (government or official as proof of identity)\n95% attendance\nPassing score on assessment \n",
      "cti:jurisdiction": [],
      "cti:minimumAge": 0,
      "cti:residentOf": [],
      "cti:targetAssessment": [
        {
          "@type": "cti:AssessmentProfile",
          "schema:description": "",
          "schema:name": " Active Standard ASTM E2659"
        }
      ],
      "cti:targetCompetency": [],
      "cti:targetCredential": [],
      "cti:targetLearningOpportunity": [],
      "cti:targetTask": []
    }
  ],
  "dc:hasPart": [],
  "dc:isPartOf": [],
  "schema:description": "coming soon",
  "schema:name": " Active Standard ASTM E2659",
  "schema:url": "http://www.astm.org/Standards/E2659.htm"
}

Note that you should be using just "id" and "type", drop the @.