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The format of an email address is local-part@domain, where the local-part may be up to 64 octets long and the domain may have a maximum of 255 octets. [5] The formal definitions are in RFC 5322 (sections 3.2.3 and 3.4.1) and RFC 5321—with a more readable form given in the informational RFC 3696 (written by J. Klensin, the author of RFC 5321) and the associated errata.
The hhhh may mix uppercase and lowercase, though uppercase is the usual style. In contrast, a character entity reference refers to a character by the name of an entity which has the desired character as its replacement text .
Uppercase Latin alphabet U+0041 A Latin Capital letter A: U+0042 B Latin Capital letter B: U+0043 C Latin Capital letter C: U+0044 D Latin Capital letter D: U+0045 E Latin Capital letter E: U+0046 F Latin Capital letter F: U+0047 G Latin Capital letter G: U+0048 H Latin Capital letter H: U+0049 I Latin Capital letter I: U+004A J Latin Capital ...
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A non-empty scheme component followed by a colon (:), consisting of a sequence of characters beginning with a letter and followed by any combination of letters, digits, plus (+), period (.), or hyphen (-). Although schemes are case-insensitive, the canonical form is lowercase and documents that specify schemes must do so with lowercase letters.
An alphanumeric outline includes a prefix at the beginning of each topic as a reference aid. The prefix is in the form of Roman numerals for the top level, upper-case letters (in the alphabet of the language being used) for the next level, Arabic numerals for the next level, and then lowercase letters for the next level.
The Address Book in Desktop Gold helps you keep track of email addresses, phone numbers, mailing addresses, birthdays, and anniversaries of your contacts. You can sort your Address Book by last name, first name, email address, screen name, telephone number, or category. Just use the Quick Find box to easily search through your contacts. Add a ...
Some naming conventions limit whether letters may appear in uppercase or lowercase. Other conventions do not restrict letter case, but attach a well-defined interpretation based on letter case. Some naming conventions specify whether alphabetic, numeric, or alphanumeric characters may be used, and if so, in what sequence.