Can literal angle brackets be used in quoted XML attribute value strings?

问题

For example, is this valid XML?:

<foo bar="3<5" />

Or do I have to escape them?:

<foo bar="3&lt;5" />

回答1:

You have to escape the literal <.

You can check this using any XML Validator.

来源：https://stackoverflow.com/questions/13687998/can-literal-angle-brackets-be-used-in-quoted-xml-attribute-value-strings