The file size, format, and EPUB version of the work must be specified to ensure accessible reading compatible with various reading devices.

Objectives

• Streamline the user experience by providing essential information regarding the downloadability and usability of the EPUB.
• Allow users to assess the EPUB’s compatibility with their device or reading software
• Enhance the transparency and interoperability of EPUB content.

Implementation

• Indicate the following technical specifications via ONIX metadata: file size, format (reflowable or fixed layout), and EPUB version 3.2) via ONIX metrics. for the format: ProductFormDetail; for the EPUB version: ProductFormFeature; for weight: FileSize.

Control

• Ensure that the values of ProductFormDetail, ProductFormFeature, and FileSize correspond to reality.