angle bracket in xml value

How can I put an angle bracket ("<") in my xml attribute?

I'm trying to sto开发者_JS百科re an SQL query, but this seems to be illegal.

<add key="query" value="SELECT DISTINCT index FROM table WHERE langCode <> 'FR'"/>

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Use < and > instead of < and >:

<add key="query" value="SELECT DISTINCT index FROM table WHERE langCode &lt;&gt; 'FR'"/>