xsl:value-of, not shows html tags

<xsl:variable name="QHelp"><b>Preblem : </b>this is solution <br/> more text
here </xsl:variable>

when is output this variable, I cant see the my text bold and no <br> works.
what is the problem with this , i use <xsl:value-of select="$QHelp"/>

Plz Help
Qazi Asim


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