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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="stylesheet" type="text/css" href="../CSS/tutorial.css">
<title>XPath Tutorial</title>
<link rel="index" href="index.html">
<link rel="previous" href="example21.html">
<link rel="next" href="example1.html">
</head>
<body>
<table xmlns="http://www.w3.org/1999/xhtml" width="100%">
<tr>
<td><span class="mediumText"><a class="naviBlack" target="_self" href="../Output/example22.html">English</a> | <a class="naviBlack" target="_self" href="../Output_cze/example22.html">česky</a> | <a class="naviBlack" target="_self" href="../Output_dut/example22.html">Nederlands</a> | <a class="naviBlack" target="_self" href="../Output_fre/example22.html">Français</a> | <a class="naviBlack" target="_self" href="../Output_spa/example22.html">Español</a> | <a class="naviBlack" target="_self" href="../Output_rus/example22.html">По-русски</a> | <a class="naviBlack" target="_self" href="../Output_ger/example22.html">Deutsch</a> | <b>>> 中文 <<</b> | <a class="naviBlack" target="_self" href="../Output_ita/example22.html">Italiano</a></span></td>
<td style="text-align:right"><span class="mediumText"><a class="naviBlack" target="_top" href="http://www.zvon.org">ZVON</a>
>
<a class="naviBlack" target="_top" href="http://www.zvon.org/index.php?nav_id=tutorials">Tutorials</a>
>
<b>XPath Tutorial</b></span></td>
</tr>
</table>
<table xmlns="http://www.w3.org/1999/xhtml" class="bar" width="750px" border="0" cellpadding="0" cellspacing="0">
<tr>
<td class="naviBlue"><a class="naviWhite" target="_top" href="../General_chi/examples.html">介绍</a>
/
<a class="naviWhite" target="_top" href="http://zvon.org/search.php">搜索</a>
/
<a class="naviWhite" target="_top" href="http://www.zvon.org"> ZVON </a></td>
</tr>
</table>
<table class="hangingMenu" border="0" cellpadding="1" cellspacing="0" width="100%">
<tr>
<td><b>>> 实例 22 <<</b>
|
<a class="naviBlack" href="example21.html">前页</a>
|
<a class="naviBlack" href="example1.html">后页</a></td>
</tr>
</table><br><div class="description">div运算符做浮点除法运算, mod运算符做求余运算, floor函数返回不大于参数的最大整数(趋近于正无穷), ceiling返回不小于参数的最小整数(趋近于负无穷)</div>
<div><a name="b9b1c29c33"></a>
</div>
<table border="1" cellpadding="5" width="85%">
<tr>
<th>//BBB[position() mod 2 = 0 ]</th>
</tr>
<tr>
<td>选择偶数位置的BBB元素</td>
</tr>
<tr>
<td class="code">
<br> <<span class="element">AAA</span>>
<br> <<span class="element">BBB</span>/>
<br> <<span class="elementOn">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="elementOn">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="elementOn">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="elementOn">BBB</span>/>
<br> <<span class="element">CCC</span>/>
<br> <<span class="element">CCC</span>/>
<br> <<span class="element">CCC</span>/>
<br> </<span class="element">AAA</span>>
</td>
</tr>
<tr>
<td><a target="_top" href="http://www.zvon.org:9001/saxon/cgi-bin/XLab/XML/xpatut_22.html?stylesheetFile=XSLT/xpath.xslt&value=//BBB[position()%20mod%202%20=%200%20]">在XLab中打开实例</a> | <a href="example22_0_png.html">树视图 (JPG)</a></td>
</tr>
</table>
<div><a name="b9b1c29c35"></a>
</div>
<table border="1" cellpadding="5" width="85%">
<tr>
<th>//BBB[ position() = floor(last() div 2 + 0.5) or position() = ceiling(last() div 2 + 0.5) ]</th>
</tr>
<tr>
<td>选择中间的BBB元素</td>
</tr>
<tr>
<td class="code">
<br> <<span class="element">AAA</span>>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="elementOn">BBB</span>/>
<br> <<span class="elementOn">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">CCC</span>/>
<br> <<span class="element">CCC</span>/>
<br> <<span class="element">CCC</span>/>
<br> </<span class="element">AAA</span>>
</td>
</tr>
<tr>
<td><a target="_top" href="http://www.zvon.org:9001/saxon/cgi-bin/XLab/XML/xpatut_22.html?stylesheetFile=XSLT/xpath.xslt&value=//BBB[%20position()%20=%20floor(last()%20div%202%20+%200.5)%20or%20position()%20=%20ceiling(last()%20div%202%20+%200.5)%20]">在XLab中打开实例</a> | <a href="example22_1_png.html">树视图 (JPG)</a></td>
</tr>
</table>
<div><a name="b9b1c29c37"></a>
</div>
<table border="1" cellpadding="5" width="85%">
<tr>
<th>//CCC[ position() = floor(last() div 2 + 0.5) or position() = ceiling(last() div 2 + 0.5) ]</th>
</tr>
<tr>
<td>选择中间的CCC元素</td>
</tr>
<tr>
<td class="code">
<br> <<span class="element">AAA</span>>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">BBB</span>/>
<br> <<span class="element">CCC</span>/>
<br> <<span class="elementOn">CCC</span>/>
<br> <<span class="element">CCC</span>/>
<br> </<span class="element">AAA</span>>
</td>
</tr>
<tr>
<td><a target="_top" href="http://www.zvon.org:9001/saxon/cgi-bin/XLab/XML/xpatut_22.html?stylesheetFile=XSLT/xpath.xslt&value=//CCC[%20position()%20=%20floor(last()%20div%202%20+%200.5)%20or%20position()%20=%20ceiling(last()%20div%202%20+%200.5)%20]">在XLab中打开实例</a> | <a href="example22_2_png.html">树视图 (JPG)</a></td>
</tr>
</table>
<div><br><br><br><div>_____________________________________________</div>
<div><a class="smallBlackLink" target="_top" href="http://zvon.org/php/Search/codes.php">Reference Search</a> |
<a class="smallBlackLink" target="_top" href="http://zvon.org/index.php?nav_id=zvonindex">Sitemap</a> |
<a class="smallBlackLink" target="_top" href="http://zvon.org/index.php?nav_id=173">XML Glossary</a>
<a class="smallBlackLink" target="_top" href="http://www.zvon.org">ZVON</a> |
<a class="smallBlackLink" target="_top" href="http://www.systinet.com">Systinet</a></div>
</div>
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</body>
</html>