如何删除XSLT中的空值?

我正在使用这个algo

http://www.jenitennison.com/xslt/grouping/muenchian.html 分组。我能够使用该算法，但我面临一个问题。我有一个xml，我在其中对Over应用分组。我能够显示我的数据，但有时@over变得blank..我不想显示这些数据.. 这是我的代码 http://xsltransform.net/pNmBxZY/1

转型

<?xml version="1.0" encoding="UTF-8" ?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
<xsl:output method="html" doctype-public="XSLT-compat" omit-xml-declaration="yes" encoding="UTF-8" indent="yes" />
<xsl:key name="node-by-over" match="Node" use="@Over" />
<xsl:template match="/Innings">
<hmtl>
<head>
<title>New Version!</title>
</head>
<xsl:apply-templates select="Node[generate-id() = generate-id(key('node-by-over', @Over)[1])]"/>
</hmtl>
</xsl:template>
<xsl:template match="Node">
over::: <h1><xsl:value-of select="@Over"/></h1>
<table id="{Over}">
<xsl:for-each select="key('node-by-over', @Over)">
<tr>
<td>balls:::<xsl:value-of select="@Ball"/></td>
<td>runs:::<xsl:value-of select="Runs"/></td>
</tr>
</xsl:for-each>
</table>
</xsl:template>
</xsl:transform>

当前结果

<!DOCTYPE html
PUBLIC "XSLT-compat">
<hmtl>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>New Version!</title>
</head>
over::: 
<h1>1</h1>
<table id="">
<tr>
<td>balls:::1</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::2</td>
<td>runs:::1</td>
</tr>
<tr>
<td>balls:::3</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::4</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::5</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::6</td>
<td>runs:::2</td>
</tr>
</table>
over::: 
<h1></h1>
<table id="">
<tr>
<td>balls:::</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::</td>
<td>runs:::0</td>
</tr>
</table>
over::: 
<h1>2</h1>
<table id="">
<tr>
<td>balls:::1</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::2</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::3</td>
<td>runs:::2</td>
</tr>
<tr>
<td>balls:::4</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::5</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::6</td>
<td>runs:::1</td>
</tr>
</table>
over::: 
<h1>3</h1>
<table id="">
<tr>
<td>balls:::1</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::2</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::3</td>
<td>runs:::1</td>
</tr>
<tr>
<td>balls:::4</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::5</td>
<td>runs:::1</td>
</tr>
</table>
</hmtl>

预期产出

<!DOCTYPE html
PUBLIC "XSLT-compat">
<hmtl>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>New Version!</title>
</head>
over::: 
<h1>1</h1>
<table id="">
<tr>
<td>balls:::1</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::2</td>
<td>runs:::1</td>
</tr>
<tr>
<td>balls:::3</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::4</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::5</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::6</td>
<td>runs:::2</td>
</tr>
</table>
over::: 
<h1>2</h1>
<table id="">
<tr>
<td>balls:::1</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::2</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::3</td>
<td>runs:::2</td>
</tr>
<tr>
<td>balls:::4</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::5</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::6</td>
<td>runs:::1</td>
</tr>
</table>
over::: 
<h1>3</h1>
<table id="">
<tr>
<td>balls:::1</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::2</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::3</td>
<td>runs:::1</td>
</tr>
<tr>
<td>balls:::4</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::5</td>
<td>runs:::1</td>
</tr>
</table>
</hmtl>

当前输出和预期输出之间的差异

over::: 
<h1></h1>
<table id="">
<tr>
<td>balls:::</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::</td>
<td>runs:::0</td>
</tr>
</table>

我不想遍历那个blank@OverNode..请参阅xml中的示例

<Node Id="14" Over=""

我不想遍历id="14"，因为它没有超值，但是当前的代码正在这样做，为什么它显示在html部分上方？如何应用检查？

当前最后一个节点显示如下

over::: 
<h1>3</h1>
<table id="">
<tr>
<td>balls:::1</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::2</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::3</td>
<td>runs:::1</td>
</tr>
<tr>
<td>balls:::4</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::5</td>
<td>runs:::1</td>
</tr>
</table>

我们可以这样展示吗

over::: 
<h1>2.5</h1>
<table id="">
<tr>
<td>balls:::1</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::2</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::3</td>
<td>runs:::1</td>
</tr>
<tr>
<td>balls:::4</td>
<td>runs:::0</td>
</tr>
<tr>
<td>balls:::5</td>
<td>runs:::1</td>
</tr>
</table>

@over.@ball(最后一个节点)

如果我理解正确，您想更改：

<xsl:apply-templates select="Node[generate-id() = generate-id(key('node-by-over', @Over)[1])]"/>

自：

<xsl:apply-templates select="Node[@Over>0][generate-id() = generate-id(key('node-by-over', @Over)[1])]"/>

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