Version 0.05_07
    1. craok read_only acseccor when value is set. 

Version 0.05_06
    1. refactoring. package variable $ac_opt change rexical variable.

Version 0.05_05
    1. read_only method should be 'get_'. If not, warnings is happen.

Version 0.05_04
    1. add read_only option

Version 0.05_03
    1. refactoring. constrain, filter, trigger accessor.

Version 0.05_02
    1. refactoring. ac funciton is simplified.

Version 0.05_01
    1. I write accessor by using meta programing.

Version 0.04_02
    1. warn in case constrain, filter, trigger options order is invalid

Version 0.04_01 
    1. document is writed at new version.

Version 0.03_06
    1. fix bag undef value cannot be set.

Version 0.03_05
    1. document update
    2. new method illegal key setting error message change

Version 0.03_04
    1. confess convert to croak because confess is bad looking.

Version 0.03_03
    the following
    1. auto confess for constrain option
    2. constrain, filter, and trigger option confess unless it isn't code ref
    
Version 0.03_02
    referctering
        DESTROY method is deleted.
       _SIMO_ac_opt method is deleted.

Version 0.03_01
    developer version
    add new method
       1. constrain
       2. fillter
       3. trigger
       
Version 0.0206
    referctaring Simo::ac_opt Simo::ac_define_class
    and default value logic 

Version 0.0205
    I'm sorry. accessor listcontext is Disable. only scalar context.

Version 0.0204
    Version of Document is collected.

Version 0.0203
    I change Makefile.PL so that you can install without make.
    
Version 0.0202
    I change module builder to Module::Build so that you can install without make.

Version 0.0201
    I don't pack test file in package. so I pack test file in package.

Version 0.02
    new method can receive hash ref.

Version 0.01_05
    Remove hook accessor option.
    Add set_hook accessor option and get_hook accessor option.
    
    Fix sub _SIMO_ac_opt
    $Simo::info{ class }{ $class }{ ac }{ opt } = $opt;
    to
    $Simo::info{ class }{ $class }{ ac }{ $key }{ opt } = $opt;
    
Version 0.01_04
    fix to be right inherit order 
    
    unshift @{ "${caller_class}::ISA" }, __PACKAGE__;
    to
    push @{ "${caller_class}::ISA" }, __PACKAGE__;

Version 0.01_03
    refactoring
    
    qq/sub ${ac_define_class}::${key}/ . qw/{ _SIMO_ac_real( '$key' , \@_ ) }/;
    to
    qq/sub ${ac_define_class}::${key} { _SIMO_ac_real( '$key' , \@_ ) }/;

Version 0.01_02
    fix this failed test.
    FAIL Simo-0.01 i386-netbsd-thread-multi-64int 4.0

Version 0.01_01
    first developer release