First Encyclopedia of Science

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 physical or digital form of a book, such as paperback, hardcover, audio CD, or board book. It indicates how the content is packaged and presented to readers.

A brief statement indicating the edition or version of a product, such as "Reprint", "New Edition", or a numeric edition number like "2nd edition". It identifies which specific release of the item is being referenced.

The age range for which a product is intended or recommended, expressed as a minimum and maximum age in years.

The calendar year in which the product was first made available to the public or released for sale. 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.

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

The mass of the product expressed in a standard unit such as grams or kilograms. It represents how heavy the item is and can be used for shipping calculations, handling instructions, or consumer information.