code: public JsonNode toJsonObject() {
  		ObjectNode node = new ObjectMapper().createObjectNode();
  		if (id != null) {
  			node.put("id", id);
  		}
  		for (DataColumn column : columns) {
  			String value = content.get(column);
  			if (value != null) {
  				node.put(column.getCode(), value);
  			} else {
  				node.put(column.getCode(), "");
  			}
  		}
  		return node;
  	}
docs: Returns this row in {@link ObjectNode} representation.
  
  @return this row in {@link ObjectNode} representation