<item>
    [...]
    <description><![CDATA[Dies ist eine <b>Demo</b>-Beschreibung]]></description>
    [...]
</item>

Item-description in HTML. The HTML-text has to be correctly encoded.

Either encode the html entities ("<strong>boldtext</strong>" --> "&lt;strong&gt;boldtext&lt;/strong&gt;")

or use CDATA (<![CDATA[<strong>boldtext</strong>]]>)

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