... 例如: class, delegate, interface, object, string。 整数(Integer literals) 实数(Real literals) ...
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RDF literals can be given data types such as "integer", "string", "date", or even "morse code".
可以为 RDF 文字给定数据类型，如“整数”、“字符串”、“日期”或甚至是“莫尔斯代码”。
Floating-Point literals may also be represented using exponential notation: a real number followed by the letter e(or E), followed by an optional plus or minus sign, followed by an integer exponent.
此外，还可以使用指数记数法表示浮点型直接量，即实数后跟随字母e或E，后面加上正负号，其后再加一个整型指数。
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