<xsl:when> and <xsl:if>

Hi there,
If  I have:
<xsl:choose>
  <xsl:when test="'name1'=name()">
    ...do something...
  </xsl:when>
  <xsl:when test="'name2'=name()">
    ..dom something else
  </xsl:when>
</xsl:choose>

and also the implementation by <xsl:if>
<xsl:if test="'name1'=name()">
    ...do something...
</xsl:if>
<xsl:if test="'name2'=name()">
    ...do something else...
</xsl:if>

Is there any differences between those two? Which one is more efficient?

Thanks!
Yue



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