Construct a new attachment model.
Private _changedPrivate _dataPrivate _rawPrivate _rawReadonly trustedWhether the data in the model is trusted.
The data associated with the model.
The metadata associated with the model.
Private _updateUpdate an observable JSON object using a readonly JSON object.
Set the data associated with the model.
Depending on the implementation of the mime model, this call may or may not have deferred effects,
Serialize the model to JSON.
The default implementation of a notebook attachment model.