Metadata describes the type and structure of data that a topic allows.
Metadata can be used for adding topics, updating topics, and parsing updates received from subscriptions.
You can also re-use particular metadata instances across multiple topics, allowing you to define well-known formats that can be applied across your application.
Metadata is accessed via the diffusion singleton.
Examples
// Creating a metadata instance var meta = new diffusion.metadata.Integer();
// Using metadata to add topics
session.topics.add('my/topic', meta);
// Using metadata to parse updates
session.subscribe('my/topic').transform(meta).on('update', function(val) {
// Do something with the integer value
});