Merriam-Webster's Collegiate Dictionary

The individual or group credited with creating the main content of a product, such as a book, film, or other creative work. The value is a free‑text string representing the name(s) of the primary creator.

The age range or maturity level for which a book is intended, indicating the appropriate reader group based on comprehension and content suitability.

The total count of individual pages contained in a book or printed publication. It represents the number of physical sheets that make up the product, regardless of layout or formatting.

The overall size of a product expressed as three numeric values—height, width and depth—with an appropriate length unit (e.g., cm, in). It allows customers to assess fit, shipping requirements and compare physical sizes across items.

The name of the entity that publishes or distributes the product, such as a book, magazine, or other media item.

The subject indicates the main theme or topic of a product, such as a book, article, or other content item. It can refer to genres, categories, or specific themes that help users understand what the product is about and find it in searches.

The calendar year in which the product was first published or released to the public. It is expressed as a four‑digit number (e.g., 2015) and can be used to filter, sort, or compare products by their release period.