1  
   2  <xsl:template name="left-trim">
   3    <xsl:param name="s" />
   4    <xsl:choose>
   5      <xsl:when test="substring($s, 1, 1) = ''">
   6        <xsl:value-of select="$s"/>
   7      </xsl:when>
   8      <xsl:when test="normalize-space(substring($s, 1, 1)) = ''">
   9        <xsl:call-template name="left-trim">
  10          <xsl:with-param name="s" select="substring($s, 2)" />
  11        </xsl:call-template>
  12      </xsl:when>
  13      <xsl:otherwise>
  14        <xsl:value-of select="$s" />
  15      </xsl:otherwise>
  16    </xsl:choose>
  17  </xsl:template>
  18  
  19  <xsl:template name="right-trim">
  20    <xsl:param name="s" />
  21    <xsl:choose>
  22      <xsl:when test="substring($s, 1, 1) = ''">
  23        <xsl:value-of select="$s"/>
  24      </xsl:when>
  25      <xsl:when test="normalize-space(substring($s, string-length($s))) = ''">
  26        <xsl:call-template name="right-trim">
  27          <xsl:with-param name="s" select="substring($s, 1, string-length($s) - 1)" />
  28        </xsl:call-template>
  29      </xsl:when>
  30      <xsl:otherwise>
  31        <xsl:value-of select="$s" />
  32      </xsl:otherwise>
  33    </xsl:choose>
  34  </xsl:template>
  35  
  36  <xsl:template name="trim">
  37    <xsl:param name="s" />
  38    <xsl:call-template name="right-trim">
  39      <xsl:with-param name="s">
  40        <xsl:call-template name="left-trim">
  41          <xsl:with-param name="s" select="$s" />
  42        </xsl:call-template>
  43      </xsl:with-param>
  44    </xsl:call-template>
  45  </xsl:template>