4D v12.1command_parameter | 
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    4D v12.1
 
command_parameter 
 
        
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                     ? | <<sql_name>> | <<$sql_name>> | <<[sql_name]sql_name>> | :sql_name | :$sql_name | :sql_name.sql_name  | 
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A command_parameter may consist of a question mark (?) or an sql_name passed in one of the following forms:
?
<<sql_name>>
<<$sql_name>>
<<[sql_name]sql_name>>
:sql_name
:$sql_name
:sql_name.sql_name
	Product:  4D
	Theme:  Syntax rules