toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (endIndex != null) 'endIndex': endIndex!,
if (license != null) 'license': license!,
if (publicationDate != null) 'publicationDate': publicationDate!,
if (startIndex != null) 'startIndex': startIndex!,
if (title != null) 'title': title!,
if (uri != null) 'uri': uri!,
};