How to use multiple context in compact and expand functions about json-gold HOT 6 CLOSED

{
  "@context": [
    "https://w3id.org/identity/v1",
    "https://w3id.org/security/v1"
  ],
  "id": "http://example.gov/credentials/3732",
  "type": ["Credential", "ProofOfAgeCredential"],
  "issuer": "https://dmv.example.gov",
  "issued": "2010-01-01",
  "claim": {
    "id": "did:ebfeb1f712ebc6f1c276e12ec21",
    "ageOver": 21
  },
  "signature": {
    "type": "LinkedDataSignature2015",
    "created": "2016-06-18T21:10:38Z",
    "creator": "https://example.com/jdoe/keys/1",
    "domain": "json-ld.org",
    "nonce": "6165d7e8",
    "signatureValue": "g4j9UrpHM4/uu32NlTw0HDaSaYF2sykskfuByD7UbuqEcJIKa+IoLJLrLjqDnMz0adwpBCHWaqqpnd47r0NKZbnJarGYrBFcRTwPQSeqGwac8E2SqjylTBbSGwKZkprEXTywyV7gILlC8a+naA7lBRi4y29FtcUJBTFQq4R5XzI="
  }
}

doc := map[string]interface{}{
        "@context": []interface{}{
            "https://w3id.org/identity/v1",
            "https://w3id.org/security/v1",
        },
        "id":     "http://example.gov/credentials/3732",
        "type":   []interface{}{"Credential", "ProofOfAgeCredential"},
        "issuer": "https://dmv.example.gov",
        "issued": "2010-01-01",
        "claim": map[string]interface{}{
            "id":      "did:ebfeb1f712ebc6f1c276e12ec21",
            "ageOver": 21,
        },
        "signature": map[string]interface{}{
            "type":           "LinkedDataSignature2015",
            "created":        "2016-06-18T21:10:38Z",
            "creator":        "https://example.com/jdoe/keys/1",
            "domain":         "json-ld.org",
            "nonce":          "6165d7e8",
            "signatureValue": "g4j9UrpHM4/uu32NlTw0HDaSaYF2sykskfuByD7UbuqEcJIKa+IoLJLrLjqDnMz0adwpBCHWaqqpnd47r0NKZbnJarGYrBFcRTwPQSeqGwac8E2SqjylTBbSGwKZkprEXTywyV7gILlC8a+naA7lBRi4y29FtcUJBTFQq4R5XzI=",
        },
    }

    expanded, err = proc.Expand(doc, options)
    if err != nil {
        panic(err)
    }

    ld.PrintDocument("JSON-LD target expansion succeeded", expanded)
    log.Println("\n\n\n")