[xsl] XSLT test condition

Hi All,
I have difficulty in testing a variable matches "text/plain" and "text/html".
Based on the out come I need to disable-output-escaping="yes". Please
help , how to resolve the same.

        <xsl:template match="node()">
                <tr>
                        <td><xsl:value-of select="name(.)" /></td>
                        <td>
                                <xsl:variable name="content_type"
select="normalize-space(preceding-sibling::Content-type[1])"/>
                                <xsl:value-of select="$content_type"/>
                                <xsl:choose>
                                <xsl:when test="$content_type=$HTML">
                                <xsl:value-of select="text()" 
disable-output-escaping="yes"/>
                                </xsl:when>
                                <xsl:otherwise>
                                 <xsl:value-of select="text()"/>
                                </xsl:otherwise>
                        </xsl:choose>

                        </td>
                </tr>
                        <xsl:apply-templates />
        </xsl:template>


Thanks,
Senthil

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