{
    "id": "http://schemas.triniti.io/json-schema/triniti/canvas/mixin/block/1-0-0.json#",
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "properties": {
        "etag": {
            "type": "string",
            "pattern": "^[\\w\\.:-]+$",
            "pbj": {
                "type": "string",
                "rule": "single"
            }
        },
        "css_class": {
            "type": "string",
            "pattern": "^[\\w\\s-]+$",
            "description": "In rendering environments that support HTML the css_class can be appended to the dom elements' class attribute.",
            "pbj": {
                "type": "string",
                "rule": "single"
            }
        },
        "updated_date": {
            "type": "string",
            "format": "date-time",
            "description": "Represents an update that occurred on the node this block is attached to. DOES NOT indicate an update to the block itself. eg an article with a twitter block with updated_date means that the article was updated to include that twitter block.",
            "pbj": {
                "type": "date-time",
                "rule": "single"
            }
        }
    },
    "additionalProperties": true
}