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函数 substring-before 返回第一个参数串中子串的前驱串，substring-after 返回第一个参数串中子串的后继串。substring 返回第一个参数串中从第二个参数位置开始，长度为第三个参数的子串。如果没有第三个参数，将会返回从第二个参数开始，一直到字串结束的子串。字符串的计数是从1开始的( XSLT stylesheet 1 )。 XSLT stylesheet 2 演示了一些参数越界或不完整的情形。

XSLT stylesheet 1

XML源码
<source>

<text>Welcome to XSL world.</text>
<string>XSL</string>
<start>4</start>
<end>10</end>

</source>

输出
<DIV>
  <B>Text: </B>Welcome to XSL world.</DIV>
<B>Text before XSL: </B>Welcome to <DIV>
  <B>Text after XSL: </B> world.</DIV>
<DIV>
  <B>Text from position 4: </B>come to XSL world.</DIV>
<DIV>
  <B>Text from position 4 of length  10: </B>come to XS</DIV>

用HTML察看
Text: Welcome to XSL world.
Text before XSL: Welcome to
Text after XSL: world.
Text from position 4: come to XSL world.
Text from position 4 of length 10: come to XS
XSLT stylesheet
<xsl:stylesheet version = '1.0'
     xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

<xsl:template match="/">
     <DIV>
          <B>
               <xsl:text>Text: </xsl:text>
          </B>
          <xsl:value-of select="//text"/>
     </DIV>
     <B>
          <xsl:text>Text before </xsl:text>
          <xsl:value-of select="//string"/>
          <xsl:text>: </xsl:text>
     </B>
     <xsl:value-of select="substring-before(//text,//string)"/>
     <DIV>
          <B>
               <xsl:text>Text after </xsl:text>
               <xsl:value-of select="//string"/>
               <xsl:text>: </xsl:text>
          </B>
          <xsl:value-of select="substring-after(//text,//string)"/>
     </DIV>
     <DIV>
          <B>
               <xsl:text>Text from position </xsl:text>
               <xsl:value-of select="//start"/>
               <xsl:text>: </xsl:text>
          </B>
          <xsl:value-of select="substring(//text,//start)"/>
     </DIV>
     <DIV>
          <B>
               <xsl:text>Text from position </xsl:text>
               <xsl:value-of select="//start"/>
               <xsl:text> of length </xsl:text>
               <xsl:value-of select="//end"/>
               <xsl:text>: </xsl:text>
          </B>
          <xsl:value-of select="substring(//text,//start,//end)"/>
     </DIV>
</xsl:template>


</xsl:stylesheet>


XSLT stylesheet 2

XML源码
<source>

<text>Welcome to XSL world.</text>
<string>XSL</string>
<start>4</start>
<end>10</end>

</source>

输出
<DIV>
  <B>Text from position -4: </B>Welcome to XSL world.</DIV>
<DIV>
  <B>Text from position 4.45: </B>come to XSL world.</DIV>
<DIV>
  <B>Text from position -8 of length  15: </B>Welcom</DIV>
<DIV>
  <B>Text from position 4.4 of length  1.7: </B>co</DIV>
<DIV>
  <B>Text from position 4.4 of length  1.2: </B>c</DIV>

用HTML察看
Text from position -4: Welcome to XSL world.
Text from position 4.45: come to XSL world.
Text from position -8 of length 15: Welcom
Text from position 4.4 of length 1.7: co
Text from position 4.4 of length 1.2: c
XSLT stylesheet
<xsl:stylesheet version = '1.0'
     xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

<xsl:template match="/">
     <DIV>
          <B>
               <xsl:text>Text from position </xsl:text>
               <xsl:value-of select="//start * -1"/>
               <xsl:text>: </xsl:text>
          </B>
          <xsl:value-of select="substring(//text,//start * -1)"/>
     </DIV>
     <DIV>
          <B>
               <xsl:text>Text from position </xsl:text>
               <xsl:value-of select="//start + 0.45"/>
               <xsl:text>: </xsl:text>
          </B>
          <xsl:value-of select="substring(//text,//start + 0.45)"/>
     </DIV>
     <DIV>
          <B>
               <xsl:text>Text from position </xsl:text>
               <xsl:value-of select="//start *-2"/>
               <xsl:text> of length </xsl:text>
               <xsl:value-of select="//end *1.5"/>
               <xsl:text>: </xsl:text>
          </B>
          <xsl:value-of select="substring(//text,//start * -2,//end * 1.5)"/>
     </DIV>
     <DIV>
          <B>
               <xsl:text>Text from position </xsl:text>
               <xsl:value-of select="//start + 0.4"/>
               <xsl:text> of length </xsl:text>
               <xsl:value-of select="//end div 10 + 0.7"/>
               <xsl:text>: </xsl:text>
          </B>
          <xsl:value-of select="substring(//text,//start + 0.4,//end div 10 + 0.7)"/>
     </DIV>
     <DIV>
          <B>
               <xsl:text>Text from position </xsl:text>
               <xsl:value-of select="//start + 0.4"/>
               <xsl:text> of length </xsl:text>
               <xsl:value-of select="//end div 10 + 0.2"/>
               <xsl:text>: </xsl:text>
          </B>
          <xsl:value-of select="substring(//text,//start + 0.4,//end div 10 + 0.2)"/>
     </DIV>
</xsl:template>


</xsl:stylesheet>


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