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2.3 Identifiers

1
Identifiers are used as names. 

Syntax

2/2
identifier ::= 
   identifier_start {identifier_start | identifier_extend}
3/2
identifier_start ::= 
     letter_uppercase
   | letter_lowercase
   | letter_titlecase
   | letter_modifier
   | letter_other
   | number_letter
3.1/2
identifier_extend ::= 
     mark_non_spacing
   | mark_spacing_combining
   | number_decimal
   | punctuation_connector
   | other_format
4/2
After eliminating the characters in category other_format, an identifier shall not contain two consecutive characters in category punctuation_connector, or end with a character in that category. 

Static Semantics

5/2
Two identifiers are considered the same if they consist of the same sequence of characters after applying the following transformations (in this order): 
5.1/2
5.2/2
5.3/2
  After applying these transformations, an identifier shall not be identical to a reserved word (in upper case). 

Implementation Permissions

6
In a nonstandard mode, an implementation may support other upper/lower case equivalence rules for identifiers, to accommodate local conventions. 
NOTES
6.1/2
3  Identifiers differing only in the use of corresponding upper and lower case letters are considered the same. 

Examples

7
Examples of identifiers:
8/2
Count      X    Get_Symbol   Ethelyn   Marion
Snobol_4   X1   Page_Count   Store_Next_Item
Πλάτων      -- Plato
Чайковский  -- Tchaikovsky
θ  φ        -- Angles

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