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Author: WikiMatrix
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English[en]
The repertoire may be closed, i.e. no additions are allowed without creating a new standard (as is the case with ASCII and most of the ISO-8859 series), or it may be open, allowing additions (as is the case with Unicode and to a limited extent the Windows code pages).
Chinese[zh]
字符表可以是封闭的,即除非创建一个新的标准(ASCII和多数ISO/IEC 8859系列都是这样的例子),否則不允许添加新的符号;字符表也可以是开放的,即允许添加新的符号(統一碼和一定程度上代碼頁是这方面的例子)。