1.4 Standards Support Requirements
To conform to [W3C-PICS-Services] a user agent must implement all required portions of the specification. Any optional portions that have been implemented must also be implemented as described by the specification. Normative language is usually used to define both required and optional portions. (For more information, see [RFC2119].)
The following table lists the sections of [W3C-PICS-Services] and whether they are considered normative or informative.
What is a "rating service"?
What is a "rating system"?
What is a "content label"?
The application/pics-service document
Explanation of Sample Rating Service
Detailed syntax of application/pics-service