How to add comments to xml?

[Solution: Single comment and multi-line comment problem in xml file]

First type (single line):

      <!--  注释内容   -->

The second type (multiple lines) :

      <!--      

      注释内容（无其他注释符）

      -->

The third type (multiple lines) :

As shown in the picture:

Under the premise that 2 has been commented, if you want to comment 1, you need to use the third comment method.

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