如何在XML文档中表示'<'字符？

Question

I've seen various questions here on SO involving Microsoft's XML documentation tags , but I'm having trouble adding some example code:

/// <summary>Return the oldest acceptable timestamp for a data packet.</summary>
/// <example>
/// if( GetOldestValidResultTime() < lastResultTime )
/// {
///     Console::WriteLine("Results are too old");
/// }
/// </example>
/// <returns>The timestamp (the Milliseconds field from a raw result) of the oldest acceptable data item given the timestamp in the latest result in the internal buffer.</returns>
long GetOldestValidResultTime();

This gives me:

DataProcessor.h(154) : warning C4635: XML document comment applied to 'MyApp.DataProcessor.GetOldestValidResultTime': badly-formed XML: Only one top level element is allowed in an XML document.

Is there any way around this other than using < which makes examples much harder to follow if you're reading the source directly as opposed to DOxygen output (for example)? ..or is the < code the only option here?

[Edit] I've tried the suggested CDATA block but it only appears to work for single-lines:

/// <example><![CDATA[ test < 5; ]]></example>
/// <example>
/// <![CDATA[ test < 5; ]]>
/// </example>

..but not multi-line comments which might actually make for a readable example:

/// <example><![CDATA[ 
/// test < 5;
/// ]]> </example>

[Edit2] Tried pierrre's suggestion of removing the \\\\'s from in front of the last two statements which predictably failed:

/// <example><![CDATA[ 
test < 5;
]]> </example>

gives:

error C2143: syntax error : missing ';' before '<'

Answer 1

使用一个CDATA块。