How to encode a linebreak in XML

Question

I have XML elements that contain text with newlines but no other formatting. The text is being read by javascript and displayed in HTML. Is there an XML-safe way to encode the linebreak, or does this text need to be CDATA?

Example:

<sample>Here is a line <br>Here is another</sample>

Answer 1

needs to be CDATA:

<sample><![CDATA[Here is a line <br />Here is another]]></sample>