taksinomhsh me vash to title:
<xsl:sort  select="title" />

taksinomhsh me vash to price:
<xsl:sort select="price" data-type="number"/>

taksinomhsh me vash to title me descending order:
<xsl:sort  select="title" order="descending"/>

taksinomhsh me vash to category:
<xsl:sort select="@*"/>

emfanhsh twn products pou ezoun price>10:
<xsl:if test="price>10"></xsl:if>

allagh xrwmatos twn title se kokkino:
<span style="color:#ff0000">
<xsl:value-of select="title"/></span>