There are 5 predefined entity references in XML:
| < | < | less than |
| > | > | greater than |
| & | & | ampersand |
| ' | ' | apostrophe |
| " | " | quotation mark |
Note: Only the characters "<" and "&" are strictly illegal in XML. Apostrophes, quotation marks and greater than signs are legal, but it is a good habit to replace them.
本文介绍了XML中五种预定义的实体引用,包括小于号、大于号、与号、撇号及引号,并强调了在XML文档中正确使用这些实体的重要性。
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