e group. See 'streaming mode' below.</li>
            <li><code>type</code> - the type of message - string/array/object/buffer</li>
            <li><code>ch</code> - for a string or buffer, the data used to the split the message as either the string or an array of bytes</li>
            <li><code>key</code> - for an object, the key of the property this message was created from. The node can be configured to also copy this value to another message properties, such as <code>msg.topic</code>.</li>
            