http://www.breezejs.com/documentation/metadata-by-hand

"Boiler plate" section:
```
The addTrack method didn't pop out of thin air. In fact it is a convenience wrapper around one of the Metadata-Helper methods.
```

"addTrack" should be "addType". The "addTrack" function is shown in the appropriate code block. The "addType" function is the helper method.