How do i put whitespace character in xsl file

hi all, i have the following snippet of code:
<xsl:if test="attribute::*">(
                 <xsl:for-each select="@*">
                   <xsl:value-of select="name()" />:
                   <xsl:value-of select="." />
                 </xsl:for-each> )
               </xsl:if>
Now, if i want to put a whitespace after the <xsl:value-of select="." />, i 
try &nbsp; but this just throws a syntax error.how can i insert a white 
space?
thank you very much!

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