XSLT：使用 XSLT 處理分層 XML 數據

Question

我有以下 XML 文檔。 每個節點下有許多子節點，但我只對其中的幾個感興趣。 我的目標是在其上運行 xslt 以生成僅包含我對它們感興趣的元素的 Json 輸出。

我采用的方法是首先將其作為 XML 處理（應用所有數據轉換、重命名、僅輸出我感興趣的元素等）然后應用另一個 xslt 將其轉換為 Json（我在網上找到了一些現成的 xslt，可以去做）。

我現在的問題主要在遞歸部分，我無法正確完成，我嘗試了 for-each/apply-templates/call-template 但我仍然很難解決它。

<MainDoc>
    <MetaData>
        <Name>MainDoc Name</Name>
        <Date>MainDoc Date</Date> <!--not interested in this element-->
    </MetaData>
    <ContentList>
        <Content/>
        <Content/>
        <Content><!--Want to process last content only-->
            <BuildList>
                <Build>
                    <Steps>
                        <Step><!--want to process all of them-->
                            <StepContentParent>
                                <StepContent>
                                    <Title>myTitle1</Title>
                                    <Details>myDetails1</Details>
                                    <Date>Step Date</Date> <!--not interested in this element-->
                                </StepContent>
                            </StepContentParent>
                            <Steps><!--Could be empty or could be the same as the previous Steps (recursion ) -->
                                <Step><!--want to process all of them-->
                                    <StepContentParent>
                                        <StepContent>
                                            <Title>myTitle1.1</Title>
                                            <Details>myDetails1.1</Details>
                                        </StepContent>
                                    </StepContentParent>
                                    <Steps/><!--Could be empty or could be the same as the previous Steps (recursion ) -->
                                    <SubDoc><!-- could be empty -->
                                        <SubDocInstance>
                                            <DocInstance>
                                                <MainDoc><!-- Same as Root (recursion ) -->
                                                    <MetaData>
                                                        <Name>Sub Doc Name</Name>
                                                    </MetaData>
                                                    <ContentList>
                                                        <Content/>
                                                        <Content/>
                                                        <Content><!--Want to process last content only-->
                                                            <BuildList>
                                                                <Build>
                                                                    <Steps>
                                                                        <Step><!--want to process all of them-->
                                                                            <StepContentParent>
                                                                                <StepContent>
                                                                                    <Title>Sub Doc myTitle1</Title>
                                                                                    <Details>Sub Doc myDetails1</Details>
                                                                                </StepContent>
                                                                            </StepContentParent>
                                                                            <Steps><!--Could be empty or could be the same as the previous Steps (recursion ) -->
                                                                                <Step><!--want to process all of them-->
                                                                                    <StepContentParent>
                                                                                        <StepContent>
                                                                                            <Title>Sub Doc myTitle1.1</Title>
                                                                                            <Details>Sub Doc myDetails1.1</Details>
                                                                                        </StepContent>
                                                                                    </StepContentParent>
                                                                                    <Steps/><!--Could be empty or could be the same as the previous Steps (recursion ) -->
                                                                                    <SubDoc><!-- could be empty -->
                                                                                        <SubDocInstance>
                                                                                            <DocInstance>
                                                                                                <MainDoc/><!-- Same as Root (recursion ) -->
                                                                                            </DocInstance>
                                                                                        </SubDocInstance>
                                                                                    </SubDoc>
                                                                                </Step>
                                                                                <step/>
                                                                                <step/>
                                                                            </Steps>
                                                                            <SubDoc><!-- could be empty -->
                                                                                <SubDocInstance>
                                                                                    <DocInstance>
                                                                                        <MainDoc/><!-- Same as Root (recursion ) -->
                                                                                    </DocInstance>
                                                                                </SubDocInstance>
                                                                            </SubDoc>
                                                                        </Step>
                                                                    </Steps>
                                                                </Build>
                                                            </BuildList>
                                                        </Content>
                                                    </ContentList>
                                                </MainDoc>
                                            </DocInstance>
                                        </SubDocInstance>
                                    </SubDoc>
                                </Step>
                                <step/>
                                <step/>
                            </Steps>
                            <SubDoc><!-- could be empty -->
                                <SubDocInstance>
                                    <DocInstance>
                                        <MainDoc/><!-- Same as Root (recursion ) -->
                                    </DocInstance>
                                </SubDocInstance>
                            </SubDoc>
                        </Step>
                        <Step>
                            <StepContentParent>
                                <StepContent>
                                    <Title>myTitle2</Title>
                                    <Details>myDetails2</Details>
                                </StepContent>
                            </StepContentParent>
                            <Steps><!--Could be empty or could be the same as the previous Steps (recursion ) -->
                                <Step><!--want to process all of them-->
                                    <StepContentParent>
                                        <StepContent>
                                            <Title>myTitle2.1</Title>
                                            <Details>myDetails2.1</Details>
                                        </StepContent>
                                    </StepContentParent>
                                    <Steps/><!--Could be empty or could be the same as the previous Steps (recursion ) -->
                                    <SubDoc><!-- could be empty -->
                                        <SubDocInstance>
                                            <DocInstance>
                                                <MainDoc/><!-- Same as Root (recursion ) -->
                                            </DocInstance>
                                        </SubDocInstance>
                                    </SubDoc>
                                </Step>
                                <step/>
                                <step/>
                            </Steps>
                        </Step>
                        <step/>
                        <step/>
                    </Steps>
                </Build>
            </BuildList>
        </Content>
    </ContentList>
</MainDoc>

Answer 1

由於使用帶有apply-templates的身份轉換具有“內置遞歸”，我不確定問題是什么，您只需將其用作起點（例如，在 XSLT 3 中使用<xsl:mode on-no-match="shallow-copy"/> )，然后添加與要刪除的元素匹配的空模板和/或與要重命名或轉換的元素匹配的模板：

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    exclude-result-prefixes="#all"
    version="3.0">

  <xsl:mode on-no-match="shallow-copy"/>

  <xsl:template match="MainDoc/MetaData/Date"/>

  <xsl:template match="StepContentParent/StepContent/Date"/>

  <xsl:template match="ContentList/Content[not(position() = last())]"/>

</xsl:stylesheet>

https://xsltfiddle.liberty-development.net/6pS26my