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在 XSLT stylesheet 1 中，函数 boolean() 的参数是字符串。字符串的值为真的充分必要条件就是字符串的长度不为零。 XSLT stylesheet 2 把文字转换为数字再传给 boolean() 函数。 XSLT stylesheet 3 把 "0" 分别作为字符串和数字进行比较。 XSLT stylesheet 4 把节点集作为 boolean() 函数的参数。

XSLT stylesheet 1

XML源码

<source>

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

</source>

输出

<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>false</TD>
</TR>
<TR>
<TD>false</TD>
<TD>true</TD>
</TR>
</TABLE>

用HTML察看

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

XSLT stylesheet

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

</xsl:stylesheet>

XSLT stylesheet 2

XML源码

<source>

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

</source>

输出

<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>NaN</TD>
<TD>false</TD>
</TR>
<TR>
<TD>false</TD>
<TD>NaN</TD>
<TD>false</TD>
</TR>
</TABLE>

用HTML察看

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

XSLT stylesheet

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

</xsl:stylesheet>

XSLT stylesheet 3

XML源码

<source>

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

</source>

输出

<P>The boolean value of "0" is <B>true</B> if "0" is a string, but <B>false</B> if "0" is a number.</P>

用HTML察看

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

XSLT stylesheet

<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>

XSLT stylesheet 4

XML源码

<source>

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

</source>

输出

<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>

用HTML察看

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

XSLT stylesheet

<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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