Diameter AVP Notation

3GPP 32.299 states the following symbols are used in the message format definitions:

• <AVP> indicates a mandatory AVP with a fixed position in the message.
• {AVP} indicates a mandatory AVP in the message.
• [AVP] indicates an optional AVP in the message.
• *AVP indicates that multiple occurrences of an AVP is possible.

This syntax is used to document the Sc Interface messages herein.