Appendix E. The Specification of Network Addresses

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In the specification the following conventions are taken:

◆variables (the fields to be substituted by concrete values) are enclosed in angle brackets and written in italic,

◆permanent text (remains after substitutions) is written in bold,

◆optional elements are enclosed in brackets,

◆the defined notion is placed on the left of the ::= character string, and the definition is placed on the right (as in the Backus-Naur form).