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The following page has been changed by SanthoshSrinivasan:
http://wiki.apache.org/pig/PigTypesFunctionalSpec

------------------------------------------------------------------------------
  
  The complete syntax for describing types will be:
  || '''type declaration''' || '''comments'''                                   
                                     ||
- || bag{<identifier> [:tuple](<identifier> [:type] [, <identifier> [:type]])}  
  ||                                 ||
+ || bag{<identifier> [: tuple](<identifier> [: type] [, <identifier> [: 
type]])}    ||                                 ||
  || bag{ }                 || indicates contents of bag are not known          
                                     ||
  || tuple( )               || indicates contents of tuple are not known        
                                     ||
- || tuple(<identifier> [:type] [, <identifier> [:type]])   ||                  
                                      ||
+ || tuple(<identifier> [: type] [, <identifier> [: type]])   ||                
                                        ||
  || map[ ]                 || key type can be of any basic type, value types 
default to bytearray but can be cast to any type. here [ and ] are type 
specifiers and not the regular expression to denote one or more instance of ||
  || int                    ||                                                  
                                     ||
  || long                   ||                                                  
                                     ||

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