notation attribute

基本解释

To select an attribute, use the @ sign before the attribute name; otherwise, the notation is pretty similar.
選擇屬性的時候要在屬性名前使用 @ 符號，其他方麪和元素都一樣。
For example, consider an element EXAMPLE with an attribute "notation" that has a default value of "decimal". The DTD fragment might be
假定我們考慮一個元素ELEMENT，它帶有一個"notation"屬性，其缺省值爲"decimal"。
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The notation declaration gives an internal name to an existing notation so that it can be referred to in attribute list declarations, unparsed entity declarations, and processing instructions.
表示法聲明爲現有表示法提供內部名稱，以便可以在屬性列表聲明、未分析實躰聲明和処理指令中引用。