看不太懂的命令，谁给解释下！

dloverares

临时存储文件里看到几类命名格式，不太懂，求解释，谢谢！
[Name] == PerfectSapphire # ['{Total:Keep}[Name] == PerfectSapphire{< 1}'] @
这条理解为不保留还是最多保留一个？

[Name] == PerfectAmethyst # ['{Total:Keep}[Name] == PerfectAmethyst{< 1}'] && ['{Total:warehouse}[Name] == PerfectAmethyst{> 1}'] @
无限存储？为啥还要这句['{Total:Keep}[Name] == PerfectAmethyst{< 1}']？keep和warehouse啥区别？

[Name] == Jewel # ['{Total:Keep}[Name] == Jewel @{< 3}'] && ['{Total:warehouse}[Name] == Jewel @{> 3}'] @
这条类似上一条，可多了2个@？