根据另一个元素值连接 XSLT 元素值 [英] Concatenate XSLT element values based on another element value

问题描述

我有以下 XML:

<root>
    <attributes>
        <attribute_value>ID1</attribute_value>
        <attribute_name>id</attribute_name>
    </attributes>
    <attributes>
        <attribute_value>ID2</attribute_value>
        <attribute_name>id</attribute_name>
    </attributes>
    <attributes>
        <attribute_value>some-link</attribute_value>
        <attribute_name>link</attribute_name>
    </attributes>
</root>

我想遍历文件并使用 XSLT(1.0 或 2.0)根据attribute_name"值连接所有attribute_value"值.所以在这种情况下，输出将是:

I want to iterate over the file and concatenate all the "attribute_value" values based on the "attribute_name" value using XSLT (1.0 or 2.0). So in this case the output would be:

<root>
    <element name="id" value="ID1"/>
    <element name="ids" value="ID1,ID2"/>
    <element name="link" value="some-link"/>
</root>

id"元素应包含遇到的第一个值，ids"元素将包含连接的值.如何做到这一点?我有一个可用的 XSLT，我在其中使用标记并遍历所有属性，但无法解决此问题.

The "id" element should contain the first value encountered and the "ids" element would contain the concatenated value. How can this be achieved? I have a working XSLT where I use the tag and iterate over all the attributes, but not able to get around this problem.

以下是我当前的 XSLT:

The following is my current XSLT:

<?xml version="1.0" encoding="ISO-8859-1"?>
    <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
        <xsl:output method="xml" version="1.0" indent="yes"/>
        <xsl:template match="root">
            <root>
                <xsl:for-each select="attributes">  
                    <xsl:variable name="attribute_name" select="attribute_name"/>
                    <xsl:variable name="attribute_value" select="attribute_value"/>
                    <xsl:if test="$attribute_name = 'link'">
                        <element name="link">
                            <xsl:attribute name="value"><xsl:value-of select="$attribute_value" /></xsl:attribute>
                        </element>
                    </xsl:if>
                </xsl:for-each>
            </root>
        </xsl:template>
    </xsl:stylesheet>

推荐答案

当您使用 XSLT 2.0 时，您可以在此处使用 xsl:for-each-group

As you are using XSLT 2.0, you can use xsl:for-each-group here

<xsl:for-each-group select="attributes" group-by="attribute_name">  

然后输出第一个元素，你可以这样做:

Then to output the first element, you can do this:

 <element name="{attribute_name}" value="{attribute_value}" />

(注意使用属性值模板来简化创建属性)

(Note the use of attribute value templates to simplify creating the attributes)

然后如果组中有多个元素，您可以像这样创建连接版本:

Then if there are more than one element in the group, you could create the concatenated version like so:

<element name="{@attribute_name}s" value="{string-join(current-group()/attribute_value, ',')}" />

试试这个 XSLT

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="xml" version="1.0" indent="yes"/>
    <xsl:template match="root">
        <root>
            <xsl:for-each-group select="attributes" group-by="attribute_name">  
                <element name="{attribute_name}" value="{attribute_value}" />
                <xsl:if test="current-group()[2]">
                    <element name="{@attribute_name}s" value="{string-join(current-group()/attribute_value, ',')}" />
                </xsl:if>
            </xsl:for-each-group>
        </root>
    </xsl:template>
</xsl:stylesheet>

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