The user message schema is used to represent all user messages (user-to-user, topic, or public-announce messages), and is coded as follows:
{
"$schema": "http://json-schema.org/draft-03/schema#",
"$content_type": "application/vnd.ccm.pmsg.v1+json",
"type": "object",
"additionalProperties": false,
"properties": {
"time_sent": {
"type":"string",
"format":"utc-millisec"
},
"sender_id": {
"type": "integer",
"optional": "false"
},
"addressee_id": {
"type": "integer",
"optional": "true"
},
"topic": {
"type": "string",
"optional": "true"
},
"subject": {
"type": "string",
"optional": "false"
},
"content": {
"type": "string",
"optional": "false"
}
}
}