OptionalendOutput only. End index into the content.
OptionallicenseOutput only. License of the attribution.
OptionalpublicationOutput only. Publication date of the attribution.
OptionalstartOutput only. Start index into the content.
OptionaltitleOutput only. Title of the attribution.
OptionaluriOutput only. Url reference of the attribution.
Source attributions for content. This data type is not supported in Gemini API.