XSLT 中的 XML 交叉引用 [英] XML cross-references in XSLT

问题描述

以下是我拥有的输入 XML 和 XSL 文件.我需要将 XML 转换为 output.xml，如下所述.我遇到了组件标签的ref"和id"属性问题.

Below are the input XML and XSL files I have. I need to transform XML into output.xml as mentioned below. I am facing issues with "ref" and "id" attributes of the component tag.

input.xml:-

input.xml:-

<?xml version="1.0" encoding="UTF-8"?>

<site id="w123" name="website 1" description="Lorem ipsum">
    <views>
        <view id="p123" name="page 1">
            <description>Lorem ipsum</description>
            <component ref="wg123"/>
            <component ref="wg1234"/>
        </view>
        <view id="p234" name="page 2">
            <description>Lorem ipsum</description>
            <component ref="wg234"/>
            <component ref="wg2345"/>
            <component ref="wg123"/>
        </view>
    </views>
    <components>
        <component id="wg123" type="TEXT">
            <text>Lorem ipsum</text>
        </component>
        <component id="wg1234" type="IMG"
                   src="image-1234.jpg"/>
        <component id="wg234" type="YOUTUBE"
                   url="youtube.com/1234"/>
        <component id="wg2345" type="BUTTON"
                   label="Click Me"/>
    </components>
</site>

我的 xslt 文件:

my xslt file:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="xml" indent="yes"/>
    <xsl:template match="site">
        <website>
            <xsl:attribute name="id">
                <xsl:value-of select="@id"/>
            </xsl:attribute>
            <xsl:attribute name="name">
                <xsl:value-of select="@name"/>
            </xsl:attribute>
            <description>
                <xsl:value-of select="@description"/>
            </description>
            <xsl:apply-templates select="views/view"/>
        </website>
    </xsl:template>
    <xsl:template match="views/view">
        <page>
            <xsl:attribute name="id">
                <xsl:value-of select="@id"/>
            </xsl:attribute>
            <xsl:attribute name="name">
                <xsl:value-of select="@name"/>
            </xsl:attribute>
            <description>
                <xsl:value-of select="description"/>
            </description>
            <xsl:for-each select="component">
                <widget>
                    <xsl:attribute name="id">
                        <xsl:value-of select="@ref"/>
                    </xsl:attribute>
                    <xsl:attribute name="type">
                        <xsl:for-each select="/site/components/component">
                            <xsl:value-of select="/site/components/component[current()/@ref]"/>
                        </xsl:for-each>
                    </xsl:attribute>
                   <!-- <xsl:value-of select="/site/components/component[current()/@ref]"/>-->

                </widget>
            </xsl:for-each>

        </page>
    </xsl:template>
</xsl:stylesheet>

我的 output.xml 使用上述 xslt 和 XML 文件:-

my output.xml using above xslt and XML files:-

<?xml version="1.0" encoding="UTF-8"?>
<website id="w123" name="website 1">
   <description>Lorem ipsum</description>
   <page id="p123" name="page 1">
      <description>Lorem ipsum</description>
      <widget id="wg123" type="">
            Lorem ipsum
        </widget>
      <widget id="wg1234" type="">
            Lorem ipsum
        </widget>
   </page>
   <page id="p234" name="page 2">
      <description>Lorem ipsum</description>
      <widget id="wg234" type="">
            Lorem ipsum
        </widget>
      <widget id="wg2345" type="">
            Lorem ipsum
        </widget>
      <widget id="wg123" type="">
            Lorem ipsum
        </widget>
   </page>
</website>

预期输出.xml:

<website id="w123" name="website 1">
    <description>Lorem ipsum</description>
    <page id="p123" name="page 1">
      <description>Lorem ipsum</description>
        <widget id="wg123" type="TEXT">
           <text>Lorem ipsum</text>
        </widget>
        <widget id="wg1234" type="img" src="image-1234.jpg"/>
    <page id="p234" name="page 2">
    <description>Lorem ipsum</description>
    <widget id="wg234" type="YOUTUBE" url="youtube.com/1234"/>
    <widget id="wg2345" type="BUTTON" label="Click Me"/>
    <widget id="wg123" type="TEXT">
        <text>Lorem ipsum</text>
    </widget>
    </page>
</website>

我正在尝试生成预期的 output.xml 文件，我必须为其编写 XSLT，但卡在组件标记的 ref 和 id 属性上.我想知道我哪里出错了.这是我第一次编写自己的 XSLT.

I am trying to generate the expected output.xml file for which I have to write XSLT but got stuck at ref and id attributes of the component tag. I want to know where I am going wrong. This is the first time I am writing my own XSLT.

推荐答案

交叉引用最好使用 key.试试:

Cross-references are best resolved by using a key. Try:

XSLT 1.0

<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>

<xsl:key name="component" match="component" use="@id" />

<xsl:template match="/site">
    <website>
        <xsl:copy-of select="@id | @name | description"/>
        <xsl:apply-templates select="views/view"/>
    </website>
</xsl:template>

<xsl:template match="view">
    <page>
        <xsl:copy-of select="@id | @name | description"/>
        <xsl:apply-templates select="component"/>
    </page>
</xsl:template>

<xsl:template match="component">
    <xsl:variable name="component" select="key('component', @ref)" />
    <widget>
        <xsl:copy-of select="$component/@id | $component/@type | $component/@url | $component/@label | $component/text"/>
    </widget>
</xsl:template>

</xsl:stylesheet>

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