输入XML
<catalog>
<product id="1">
<name>abc</name>
<category>aaa</category>
<category>bbb</category>
<category>ccc</category>
</product>
<product id="2">
<name>cde</name>
<category>aaa</category>
<category>bbb</category>
</product>
</catalog>
预期输出 xml
<products>
<product>
<id>1</id>
<name>abc</name>
<category>aaa,bbb,ccc</category>
</product>
<product>
<id>2</id>
<name>cde</name>
<category>aaa,bbb</category>
</product>
</products>
用于转换的 XSLT
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:template match="/catalog">
<products>
<xsl:for-each select="product">
<product>
<id><xsl:value-of select="@id"/></id>
<name><xsl:value-of select="name"/></name>
<category><xsl:value-of select="category" /></category>
</product>
</xsl:for-each>
</products>
</xsl:template>
</xsl:stylesheet>
实际输出 xml :(
<products>
<product>
<id>1</id>
<name>abc</name>
<category>aaa</category>
</product>
<product>
<id>2</id>
<name>cde</name>
<category>aaa</category>
</product>
</products>
在每个“产品”下按名称“类别”循环遍历所有兄弟节点并合并/连接到以逗号分隔的单个节点所需的代码。每个产品的“类别”数量各不相同,因此数量未知。
使用定义的这个方便的连接调用模板here,这变得简单如下:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:template match="/catalog">
<products>
<xsl:for-each select="product">
<product>
<id>
<xsl:value-of select="@id"/>
</id>
<name>
<xsl:value-of select="name"/>
</name>
<category>
<xsl:call-template name="join">
<xsl:with-param name="list" select="category" />
<xsl:with-param name="separator" select="','" />
</xsl:call-template>
</category>
</product>
</xsl:for-each>
</products>
</xsl:template>
<xsl:template name="join">
<xsl:param name="list" />
<xsl:param name="separator"/>
<xsl:for-each select="$list">
<xsl:value-of select="." />
<xsl:if test="position() != last()">
<xsl:value-of select="$separator" />
</xsl:if>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
Output:
<products>
<product>
<id>1</id>
<name>abc</name>
<category>aaa,bbb,ccc</category>
</product>
<product>
<id>2</id>
<name>cde</name>
<category>aaa,bbb</category>
</product>
</products>
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