Wat are Reserved Words (Keywords) in a language?

Card Puncher Data Processing


A reserved word is a special token in a language that cannot be used by the programmer because they are already used by the application and have a special meaning.


  • In a URL, the backslash is used in the path
  • In Xml, the greater than (<) is used in the tag
  • In Java, the class word is used to define a class


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Card Puncher Data Processing
Antlr - (Grammar|Lexicon) (g4)

Grammar in the context of Antlr. The grammar definition of Antlr is called a antlr/antlr4/blob/master/doc/lexicon.mdLexicon because the grammar is used by the lexer (hence the lexer grammar) See: ...
Process States
Command Argument

This page is argument of a command. When the command is started via a shell script (manual or automatic), the arguments: are separated by one or more blank space should be quoted if the value...
Lexical Analysis - (Token|Lexical unit|Lexeme|Symbol|Word)

A token is symbols of the vocabulary of the language. Each token is a single atomic unit of the language. The token syntax is typically a regular language, so a finite state automaton constructed from...
Obiee Presentation Service System Variable
OBIEE - Presentation Variable System (reserved variable)

The presentation service has some presentation variables that are reserved to give specific information. You can use them in your answer such as @{system.currentTime} to filter depending of the current...
Obiee11g System Session Variable
OBIEE - System session variables (reserved variables)

System session variables are session variables that the Oracle BI Server and Oracle BI Presentation Services use for specific purposes. System session variables have reserved names, that cannot be used...
Card Puncher Data Processing
R - Reserved (Variable|Words)

Reserved word in R
Bash Liste Des Attaques Ovh
Shell - Reserved Words

Reserved words in bash. This words are recognized as reserved when: unquoted and either the first word of a simple command or the third word of a case or for command. ! : logical negation...
HTML /XML - Reserved Character/Word

This page is the reserved word/characters of XML based language. If a reserved character is in : the value of an attribute, it should be first encoded in a entity the node value: in Xml: you...
What is Base64? (Cryptography Cipher)

Base64 is a cipher (without key and reversible) that converts (encode) a data (message) in 64 characters of the ASCII string. See also the Google...
Url Encoding Set Illustration
What is URL encoding ? known also as Percent-encoding

In a URL / Uniform Resource Identifier (URI), you have reserved character that are part of the URL syntax that cannot be used. For instance: * the scheme separator : * or the path separator / Percent-encoding,...

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