No. Each line in binds define two things: a bind between a schema class and a engine class, and an alias for the class (the first element in the list in lowercase) used while defining objects in json. Instead of:

```javascript
...
{
   event: {
      class: es.eucm.ead.schema.behaviors.Touch
   }
}
```

adding that line in bind allow us to do:
```javascript
{
   event: {
      class: touch
   }
}
```

More info: https://github.com/e-ucm/ead/wiki/Bindings Alias are