...

The suggested way of approaching these documentation pages is to first get acquainted with the Glossary; getting acquainted with the UI in Understanding the UI elements; then trying to perform the examples in the Guides. finally reading the Use cases to put the gathered knowledge into a wider perspective. All the while revisiting the the Glossary when when/if there is any confusion/doubts; and finally reading the Use cases to put the gathered knowledge into a wider perspective.

MUST, SHOULD

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in these pages are to be interpreted as described in RFC 2119.