What is an example of structured metadata for a book?

A table of contents is a list of chapters or sections in a book, providing an overview of the structure and organization of the content. While it is informative, it is not typically classified as structured metadata, as it does not consistently describe the resource's attributes in a standardized way but rather presents a navigational aid.

The title of a book is a significant element; however, it is considered unstructured metadata as it does not follow a standardized format for categorization or indexing. It serves as an identifier but does not provide detailed information about the book's attributes or creator in a structured manner.

Copyright information indicates the legal rights associated with a book, such as ownership and protection. While it is important for legal purposes, it does not represent structured metadata, as it does not describe the book's content, author, or other key characteristics in a standardized format.