问题描述
我需要从某些XML元素中解码Base64字符串. type="xs:base64binary"定义的元素和type="xs:string"定义的元素之间有什么区别吗?一些XSD开发人员拒绝将编码的字符串标记为base64binary.如果没有区别，type="xs:base64binary"的用途是什么?
I need to decode a Base64 string from some XML element. Is there any difference between an element defined by type="xs:base64binary" and an element defined by type="xs:string"? Some XSD developers refuse to mark encoded strings as a base64binary. If there is no difference, what is the use of type="xs:base64binary"?
推荐答案
如果我理解规范正确，但在语义上有所不同.
If I understand the specs correctly, there is a semantic difference.
base64Binary元素包含已编码为base64的任意二进制数据，这使得它基本上是一个字符串(或至少与字符串兼容).
A base64Binary element contains arbitrary, binary data that has been encoded as base64, which makes it basically a string (or at least string-compatible).
另一方面，字符串包含可打印的字符，这些字符通常构成单词和句子(自然语言).它们不能包含任意(二进制)数据，因为不允许某些字符.
On the other hand, strings contain printable characters, which (usually) make up words and sentences (natural language). They cannot contain arbitrary (binary) data, because certain characters aren't allowed.
您可以使用base64Binary表示解码后的数据不适合人类消费，因为string是可读/可打印的.
You can use base64Binary to indicate that the decoded data is not suitable for human consumption, where as string is readable/printable.
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