Optional. The entity type name prefixed with ``@``. This
field is required for annotated parts of the training
Optional. The parameter name for the value
extracted from the annotated part of the
example. This field is required for annotated
parts of the training phrase.
Optional. Indicates whether the text was
manually annotated. This field is set to true
when the Dialogflow Console is used to manually
annotate the part. When creating an annotated
part with the API, you must set this to true.