(Physical) 实体层定义的是电子及物理装置介面的规格，如针脚 、电压、缆线规范等，同时进行讯号编码(signal encoding)，将资料内0与1的讯号转换成电讯的开 与关(on/off)。
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料号编码原则制订及维护。
下面是US - ASCII编码字符集中这些函数将采用百分号编码的的可打印字符列表，码值为32到126(十进制)。
Following is a list of printable characters from the US-ASCII coded character set, specifically the octets ranging from 32 to 126 (decimal), that the functions will percent-encode.
EXSLT定义的str： encode - uri也执行百分号编码，但是与encode - for - uri相比少了5个保留字符。
EXSLT defines STR: encode-uri , which also performs percent-encoding, but for five fewer reserved characters compared to encode-for-uri .
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