toMap method
Implementation
Map<String, String?> toMap() => {
'title': title,
'author': author,
'subject': subject,
'keywords': keywords,
'creator': creator,
'producer': producer,
'creationDate': creationDate,
'modDate': modDate,
'format': format,
'encryption': encryption,
'trapped': trapped ? 'True' : 'False',
};