Handling text requires that there be some convention for converting characters into the Numbers computers actually handle; these conventions are called character encodings.
处理文本需要某种约定将字符转换为计算机实际可以处理的数字；这些约定叫做字符编码。
2
There are a lot of complexities with XML's character representation and handling that have caused unpleasant surprises for developers, and endless debate in the XML community.
While XSL is adept at handling namespaces on both elements and attributes in the input document, its constructs for dealing with them inside attribute values and character data are somewhat weak.