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В преобразовании 1 строки являются аргументами функции boolean(). Строка является "истиной" тогда и только тогда, когда ее длина ненулевая. В преобразовании 2 текст конвертируется в числовой тип, а затем передается в качестве аргументов функции boolean(). Преобразование 3 показывает разницу между тем, когда "0" является числом, и когда — строкой. В преобразовании 4 в качестве аргумента функции boolean() используется подмножество узлов.

Преобразование 1

Исходный Surf

<source>

 
<text>124</text>
 
<text>AB234</text>
 
<text>-16</text>
 
<text>0</text>
 
<text/>
 
<text>false</text>
 

</source>

Результат

<TABLE border="1">
   <TR>
      <TH>text</TH>
      <TH>boolean</TH>
   </TR>
   <TR>
      <TD>124 </TD>
      <TD>true</TD>
   </TR>
   <TR>
      <TD>AB234 </TD>
      <TD>true</TD>
   </TR>
   <TR>
      <TD>-16 </TD>
      <TD>true</TD>
   </TR>
   <TR>
      <TD>0 </TD>
      <TD>true</TD>
   </TR>
   <TR>
      <TD> </TD>
      <TD>false</TD>
   </TR>
   <TR>
      <TD>false </TD>
      <TD>true</TD>
   </TR>
</TABLE>

Представление HTML

text	boolean
124	true
AB234	true
-16	true
0	true
	false
false	true

Преобразование XSLT

<xsl:stylesheet version = '1.0' 
     xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

 
<xsl:template match="/">
 
     <TABLE border="1">
 
          <TR>
               <TH>text</TH>
               <TH>boolean</TH>
          </TR>
 
          <xsl:for-each select="//text">
 
               <TR>
 
                    <TD>
                         <xsl:value-of select="."/>
 
                         <xsl:text> </xsl:text>
 
                    </TD>
 
                    <TD>
                         <xsl:value-of select="boolean(text())"/>
                    </TD>
 
               </TR>
 
          </xsl:for-each>
 
     </TABLE>
 
</xsl:template>

 

</xsl:stylesheet>

Преобразование 2

Исходный Surf

<source>

 
<text>124</text>
 
<text>AB234</text>
 
<text>-16</text>
 
<text>0</text>
 
<text/>
 
<text>false</text>
 

</source>

Результат

<TABLE border="1">
   <TR>
      <TH>text</TH>
      <TH>number</TH>
      <TH>boolean</TH>
   </TR>
   <TR>
      <TD>124 </TD>
      <TD>124 </TD>
      <TD>true</TD>
   </TR>
   <TR>
      <TD>AB234 </TD>
      <TD>NaN </TD>
      <TD>false</TD>
   </TR>
   <TR>
      <TD>-16 </TD>
      <TD>-16 </TD>
      <TD>true</TD>
   </TR>
   <TR>
      <TD>0 </TD>
      <TD>0 </TD>
      <TD>false</TD>
   </TR>
   <TR>
      <TD> </TD>
      <TD>NaN </TD>
      <TD>false</TD>
   </TR>
   <TR>
      <TD>false </TD>
      <TD>NaN </TD>
      <TD>false</TD>
   </TR>
</TABLE>

Представление HTML

text	number	boolean
124	124	true
AB234	NaN	false
-16	-16	true
0	0	false
	NaN	false
false	NaN	false

Преобразование XSLT

<xsl:stylesheet version = '1.0' 
     xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

 
<xsl:template match="/">
 
     <TABLE border="1">
 
          <TR>
               <TH>text</TH>
               <TH>number</TH>
               <TH>boolean</TH>
          </TR>
 
          <xsl:for-each select="//text">
 
               <TR>
 
                    <TD>
                         <xsl:value-of select="."/>
 
                         <xsl:text> </xsl:text>
 
                    </TD>
 
                    <TD>
                         <xsl:value-of select="number(text())"/>
 
                         <xsl:text> </xsl:text>
 
                    </TD>
 
                    <TD>
                         <xsl:value-of select="boolean(number(text()))"/>
                    </TD>
 
               </TR>
 
          </xsl:for-each>
 
     </TABLE>
 
</xsl:template>

 

</xsl:stylesheet>

Преобразование 3

Исходный Surf

<source>

 
<text>124</text>
 
<text>AB234</text>
 
<text>-16</text>
 
<text>0</text>
 
<text/>
 
<text>false</text>
 

</source>

Результат

The boolean value of "0" is true if "0" is a string, but false if "0" is a number.

Представление HTML

The boolean value of "0" is true if "0" is a string, but false if "0" is a number.

Преобразование XSLT

<xsl:stylesheet version = '1.0' 
     xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

 
<xsl:template match="/">
 
     <P>
 
          <xsl:text>The boolean value of "0" is </xsl:text>
 
          <B>
               <xsl:value-of select="boolean(//text[text()='0'])"/>
          </B>
 
          <xsl:text> if "0" is a string, but </xsl:text>
 
          <B>
               <xsl:value-of select="boolean(number((//text[text()='0'])))"/>
          </B>
 
          <xsl:text> if "0" is a number.</xsl:text>
 
     </P> 
 
</xsl:template>

 

</xsl:stylesheet>

Преобразование 4

Исходный Surf

<source>

 
<text>124</text>
 
<text>AB234</text>
 
<text>-16</text>
 
<text>0</text>
 
<text/>
 
<text>false</text>
 

</source>

Результат

<TABLE border="1">
   <TR>
      <TH>node-set</TH>
      <TH>boolean</TH>
   </TR>
   <TR>
      <TD>/</TD>
      <TD>true</TD>
   </TR>
   <TR>
      <TD>//text</TD>
      <TD>true</TD>
   </TR>
   <TR>
      <TD>//number</TD>
      <TD>false</TD>
   </TR>
   <TR>
      <TD>//text[23]</TD>
      <TD>false</TD>
   </TR>
</TABLE>

Представление HTML

node-set	boolean
/	true
//text	true
//number	false
//text[23]	false

Преобразование XSLT

<xsl:stylesheet version = '1.0' 
     xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

 
<xsl:template match="/">
 
     <TABLE border="1">
 
          <TR>
               <TH>node-set</TH>
               <TH>boolean</TH>
          </TR>
 
          <TR>
               <TD>
 
                    <xsl:text>/</xsl:text>
 
               </TD>
               <TD>
 
                    <xsl:value-of select="boolean(/)"/>
 
               </TD>
          </TR>
 
          <TR>
               <TD>
 
                    <xsl:text>//text</xsl:text>
 
               </TD>
               <TD>
 
                    <xsl:value-of select="boolean(//text)"/>
 
               </TD>
          </TR>
 
          <TR>
               <TD>
 
                    <xsl:text>//number</xsl:text>
 
               </TD>
               <TD>
 
                    <xsl:value-of select="boolean(//number)"/>
 
               </TD>
          </TR>
 
          <TR>
               <TD>
 
                    <xsl:text>//text[23]</xsl:text>
 
               </TD>
               <TD>
 
                    <xsl:value-of select="boolean(//text[23])"/>
 
               </TD>
          </TR>
 
     </TABLE>
 
</xsl:template>

 

</xsl:stylesheet>

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