flat XML 到使用 XSLT 嵌套

Question

在这上面花了太多时间.."f$%" 希望你能分享你的经验。我的源平面 XML 来自外部数据库，结构如下：

 <?xml version="1.0" encoding="utf-8"?>
    <ns:MT_ActualCosts xmlns:ns="http://percite:scmaster/actual_costs">
        <row>
            <EVENT_ID>106</EVENT_ID>
            <LINE_NUMBER>0</LINE_NUMBER>
            <INVOICE_NUMBER>9999</INVOICE_NUMBER>
            <INVOICE_DATE>2015-02-09 00:00:00.0</INVOICE_DATE>
            <CURRENCY_CODE>USD</CURRENCY_CODE>
            <TOTAL_AMOUNT_NET>0001</TOTAL_AMOUNT_NET>
            <RO_NUMBER>102808</RO_NUMBER>
        </row>
        <row>
            <EVENT_ID>106</EVENT_ID>
            <LINE_NUMBER>1</LINE_NUMBER>
            <INVOICE_NUMBER>24444</INVOICE_NUMBER>
            <PLANT>0003</PLANT>
            <ALLOCATION_AMOUNT>122</ALLOCATION_AMOUNT>
        </row>
        <row>
            <EVENT_ID>109</EVENT_ID>
            <LINE_NUMBER>0</LINE_NUMBER>
            <INVOICE_NUMBER>24458</INVOICE_NUMBER>
            <INVOICE_DATE>2015-02-09 00:00:00.0</INVOICE_DATE>
            <CURRENCY_CODE>USD</CURRENCY_CODE>
            <TOTAL_AMOUNT_NET>0011</TOTAL_AMOUNT_NET>
            <RO_NUMBER>102813</RO_NUMBER>
        </row>
        <row>
            <EVENT_ID>109</EVENT_ID>
            <LINE_NUMBER>1</LINE_NUMBER>
            <INVOICE_NUMBER>24458</INVOICE_NUMBER>
            <PLANT>0003</PLANT>
            <ALLOCATION_AMOUNT>11.1</ALLOCATION_AMOUNT>
        </row>
        <row>
            <EVENT_ID>108</EVENT_ID>
            <LINE_NUMBER>0</LINE_NUMBER>
            <INVOICE_NUMBER>24535</INVOICE_NUMBER>
            <INVOICE_DATE>2015-02-19 00:00:00.0</INVOICE_DATE>
            <CURRENCY_CODE>USD</CURRENCY_CODE>
            <TOTAL_AMOUNT_NET>11</TOTAL_AMOUNT_NET>
            <RO_NUMBER>102811</RO_NUMBER>
        </row>
        <row>
            <EVENT_ID>108</EVENT_ID>
            <LINE_NUMBER>1</LINE_NUMBER>
            <INVOICE_NUMBER>24535</INVOICE_NUMBER>
            <PLANT>0002</PLANT>
            <ALLOCATION_AMOUNT>11</ALLOCATION_AMOUNT>
        </row>
        <row>
            <EVENT_ID>171</EVENT_ID>
            <LINE_NUMBER>0</LINE_NUMBER>
            <INVOICE_NUMBER>24645</INVOICE_NUMBER>
            <INVOICE_DATE>2015-02-28 00:00:00.0</INVOICE_DATE>
            <CURRENCY_CODE>USD</CURRENCY_CODE>
            <TOTAL_AMOUNT_NET>999999</TOTAL_AMOUNT_NET>
            <RO_NUMBER>103063</RO_NUMBER>
        </row>
        <row>
            <EVENT_ID>171</EVENT_ID>
            <LINE_NUMBER>1</LINE_NUMBER>
            <INVOICE_NUMBER>24645</INVOICE_NUMBER>
            <PLANT>0001</PLANT>
            <ALLOCATION_AMOUNT>11.47</ALLOCATION_AMOUNT>
        </row>
        <row>
            <EVENT_ID>171</EVENT_ID>
            <LINE_NUMBER>2</LINE_NUMBER>
            <INVOICE_NUMBER>24645</INVOICE_NUMBER>
            <PLANT>0001</PLANT>
            <ALLOCATION_AMOUNT>11.53</ALLOCATION_AMOUNT>
        </row>
    </ns:MT_ActualCosts>


My requested Target Structure should be something like this:

[![enter image description here][1]][1]

I need to group under the Header segments RecordLine Segments of the same `EVENT_ID`.

Currently my XSLT can't create the needed structure.
this is my XSLT:

    <?xml version="1.0" encoding="UTF-8"?>
    <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:ns0="http://percite:scmaster/actual_costs">
    <xsl:output method="xml" indent="yes"/>

    <!-- xsi:noNamespaceSchemaLocation="\palnt03\palramnet-redirect$\IL-Users\My-Documents\nimrod_g\SAP\Projects\ScMaster\Finance\ActualCosts\development\xsd"> -->
    <xsl:template match="/">
    <ns0:MT_ActualCostPreNormalized>
    <xsl:for-each select= "ns0:MT_ActualCosts/row">
        <xsl:if test="LINE_NUMBER=0">
            <Header>
            <EVENT_ID><xsl:value-of select="EVENT_ID"></xsl:value-of>
            </EVENT_ID>
            <LINE_NUMBER>
            <xsl:value-of select="LINE_NUMBER"/>
            </LINE_NUMBER>
            <INVOICE_NUMBER>
                    <xsl:value-of select="INVOICE_NUMBER"/>
                    </INVOICE_NUMBER>
                    <CURRENCY_CODE>
                    <xsl:value-of select="CURRENCY_CODE"/>
                    </CURRENCY_CODE>
                    <TOTAL_AMOUNT_NET>
                    <xsl:value-of select="TOTAL_AMOUNT_NET"/>
                    </TOTAL_AMOUNT_NET>
                    <RO_NUMBER>
                    <xsl:value-of select="RO_NUMBER"/>
                    </RO_NUMBER>
                    <PLANT>
                    <xsl:value-of select="PLANT"/>
                    </PLANT>
                    <ALLOCATION_AMOUNT>
                    <xsl:value-of select="ALLOCATION_AMOUNT"/>
                    </ALLOCATION_AMOUNT>
            </Header>
        </xsl:if>
                <xsl:if test="LINE_NUMBER!=0">
                        <RecordLine>
                        <EVENT_ID><xsl:value-of select="EVENT_ID"></xsl:value-of>
                        </EVENT_ID>
                        <LINE_NUMBER>
                        <xsl:value-of select="LINE_NUMBER"/>
                        </LINE_NUMBER>
                        <INVOICE_NUMBER>
                        <xsl:value-of select="INVOICE_NUMBER"/>
                        </INVOICE_NUMBER>
                        <CURRENCY_CODE>
                        <xsl:value-of select="CURRENCY_CODE"/>
                        </CURRENCY_CODE>
                        <TOTAL_AMOUNT_NET>
                        <xsl:value-of select="TOTAL_AMOUNT_NET"/>
                        </TOTAL_AMOUNT_NET>
                        <RO_NUMBER>
                        <xsl:value-of select="RO_NUMBER"/>
                        </RO_NUMBER>
                        <PLANT>
                        <xsl:value-of select="PLANT"/>
                        </PLANT>
                        <ALLOCATION_AMOUNT>
                        <xsl:value-of select="ALLOCATION_AMOUNT"/>
                        </ALLOCATION_AMOUNT>
                        </RecordLine>
                </xsl:if>
        </xsl:for-each>
    </ns0:MT_ActualCostPreNormalized>
    </xsl:template>
    </xsl:stylesheet> 


  [1]: http://i.stack.imgur.com/yklFq.jpg

在实施了 Daniel Haley 提供的大部分代码之后，似乎已经很接近解决方案了。根据 Martin 的要求，我在此处添加当前使用的 XSLT + 当前结果 XML。我将尝试澄清我的 XSLT 程序规则： 1.Each 来自来源 XML 的记录应该分析如下：如果 LINE_NUMBER = 0 那么这是一个头记录并且应该产生一个段**。（它不应该被添加到段中）** - 如果 LINE_NUMBER 大于 0 且其 EVENT_ID 等于生成该段的行，则这是同一段上下文中的 RecordLine，应在同一段下打开一个段。” 从结果中可以看出一些问题 xml:

前4组Headers-RecordLines出来nicley(EventIDs 100 到 104) 。但是在 EVENT_ID 105 上出了点问题。可以看到 LINE_NUMBER=0 的行创建了一个 Header 段，但也在记录行中添加了两次数据。这是错误的结果。
从这一点开始，所有的记录都变得一团糟。目前我不能说为什么会这样。我添加了来自我们测试数据库的部分源 XML（如图所示）。我已经添加了部分结果 XML（如图）希望这些注释能够解决问题。

Source XML part with event 105

Result XML part with event 105

Answer 1

当你写到你想要对元素进行分组时，我想作为起点你可以使用 for-each-group 而不是 for-each:

<?xml version="1.0" encoding="UTF-8" ?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"
xmlns:ns0="http://percite:scmaster/actual_costs">

    <xsl:output indent="yes"/>

    <xsl:template match="@*|node()">
        <xsl:copy copy-namespaces="no">
            <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="/*">
        <ns0:MT_ActualCostPreNormalized>
          <xsl:for-each-group select="row" group-by="EVENT_ID">
              <Header>
                  <xsl:apply-templates select="EVENT_ID, LINE_NUMBER, current-group()"/>
              </Header>
          </xsl:for-each-group>
        </ns0:MT_ActualCostPreNormalized>
    </xsl:template>

    <xsl:template match="row">
        <RecordLine>
            <xsl:apply-templates/>
        </RecordLine>
    </xsl:template>
</xsl:transform>

您可以在 apply-templates 中的 Header 下面列出您想要的更多元素。

Answer 2

由于您使用的是 XSLT 2.0，因此可以使用 xsl:for-each-group (see XSLT 2.0 grouping) 按 EVENT_ID 进行分组。

此外，使用 identity transform 来处理所有不需要更改的元素。

示例...

XML 输入

<ns:MT_ActualCosts xmlns:ns="http://percite:scmaster/actual_costs">
    <row>
        <EVENT_ID>106</EVENT_ID>
        <LINE_NUMBER>0</LINE_NUMBER>
        <INVOICE_NUMBER>9999</INVOICE_NUMBER>
        <INVOICE_DATE>2015-02-09 00:00:00.0</INVOICE_DATE>
        <CURRENCY_CODE>USD</CURRENCY_CODE>
        <TOTAL_AMOUNT_NET>0001</TOTAL_AMOUNT_NET>
        <RO_NUMBER>102808</RO_NUMBER>
    </row>
    <row>
        <EVENT_ID>106</EVENT_ID>
        <LINE_NUMBER>1</LINE_NUMBER>
        <INVOICE_NUMBER>24444</INVOICE_NUMBER>
        <PLANT>0003</PLANT>
        <ALLOCATION_AMOUNT>122</ALLOCATION_AMOUNT>
    </row>
    <row>
        <EVENT_ID>109</EVENT_ID>
        <LINE_NUMBER>0</LINE_NUMBER>
        <INVOICE_NUMBER>24458</INVOICE_NUMBER>
        <INVOICE_DATE>2015-02-09 00:00:00.0</INVOICE_DATE>
        <CURRENCY_CODE>USD</CURRENCY_CODE>
        <TOTAL_AMOUNT_NET>0011</TOTAL_AMOUNT_NET>
        <RO_NUMBER>102813</RO_NUMBER>
    </row>
    <row>
        <EVENT_ID>109</EVENT_ID>
        <LINE_NUMBER>1</LINE_NUMBER>
        <INVOICE_NUMBER>24458</INVOICE_NUMBER>
        <PLANT>0003</PLANT>
        <ALLOCATION_AMOUNT>11.1</ALLOCATION_AMOUNT>
    </row>
    <row>
        <EVENT_ID>108</EVENT_ID>
        <LINE_NUMBER>0</LINE_NUMBER>
        <INVOICE_NUMBER>24535</INVOICE_NUMBER>
        <INVOICE_DATE>2015-02-19 00:00:00.0</INVOICE_DATE>
        <CURRENCY_CODE>USD</CURRENCY_CODE>
        <TOTAL_AMOUNT_NET>11</TOTAL_AMOUNT_NET>
        <RO_NUMBER>102811</RO_NUMBER>
    </row>
    <row>
        <EVENT_ID>108</EVENT_ID>
        <LINE_NUMBER>1</LINE_NUMBER>
        <INVOICE_NUMBER>24535</INVOICE_NUMBER>
        <PLANT>0002</PLANT>
        <ALLOCATION_AMOUNT>11</ALLOCATION_AMOUNT>
    </row>
    <row>
        <EVENT_ID>171</EVENT_ID>
        <LINE_NUMBER>0</LINE_NUMBER>
        <INVOICE_NUMBER>24645</INVOICE_NUMBER>
        <INVOICE_DATE>2015-02-28 00:00:00.0</INVOICE_DATE>
        <CURRENCY_CODE>USD</CURRENCY_CODE>
        <TOTAL_AMOUNT_NET>999999</TOTAL_AMOUNT_NET>
        <RO_NUMBER>103063</RO_NUMBER>
    </row>
    <row>
        <EVENT_ID>171</EVENT_ID>
        <LINE_NUMBER>1</LINE_NUMBER>
        <INVOICE_NUMBER>24645</INVOICE_NUMBER>
        <PLANT>0001</PLANT>
        <ALLOCATION_AMOUNT>11.47</ALLOCATION_AMOUNT>
    </row>
    <row>
        <EVENT_ID>171</EVENT_ID>
        <LINE_NUMBER>2</LINE_NUMBER>
        <INVOICE_NUMBER>24645</INVOICE_NUMBER>
        <PLANT>0001</PLANT>
        <ALLOCATION_AMOUNT>11.53</ALLOCATION_AMOUNT>
    </row>
</ns:MT_ActualCosts>

XSLT 2.0

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
  xmlns:ns="http://percite:scmaster/actual_costs">
  <xsl:output indent="yes"/>
  <xsl:strip-space elements="*"/>

  <!--Identity transform.-->
  <xsl:template match="@*|node()">
    <xsl:copy>
      <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="/*">
    <ns:MT_ActualCostPreNormalized>
      <!--Group rows by EVENT_ID.-->
      <xsl:for-each-group select="row" group-by="EVENT_ID">
        <!--Optional sort by EVENT_ID.-->
        <xsl:sort select="current-grouping-key()"/>
        <Header>
          <!--Apply templates to the children of row's with a LINE_NUMBER of 0 
          followed by row's that have a LINE_NUMBER that isn't equal to 0.-->
          <xsl:apply-templates select="current-group()[LINE_NUMBER=0]/*,
            current-group()[not(LINE_NUMBER=0)]">
            <!--Optional sort by LINE_NUMBER.-->
            <xsl:sort select="LINE_NUMBER"/>
          </xsl:apply-templates>
        </Header>
      </xsl:for-each-group>
    </ns:MT_ActualCostPreNormalized>
  </xsl:template>

  <!--Because of the apply-templates, the only row elements matched 
  should be row's with a LINE_NUMBER > 0.-->
  <xsl:template match="row">
    <RecordLine>
      <xsl:apply-templates/>
    </RecordLine>          
  </xsl:template>

</xsl:stylesheet>

XML输出

<ns:MT_ActualCostPreNormalized xmlns:ns="http://percite:scmaster/actual_costs">
   <Header>
      <EVENT_ID>106</EVENT_ID>
      <LINE_NUMBER>0</LINE_NUMBER>
      <INVOICE_NUMBER>9999</INVOICE_NUMBER>
      <INVOICE_DATE>2015-02-09 00:00:00.0</INVOICE_DATE>
      <CURRENCY_CODE>USD</CURRENCY_CODE>
      <TOTAL_AMOUNT_NET>0001</TOTAL_AMOUNT_NET>
      <RO_NUMBER>102808</RO_NUMBER>
      <RecordLine>
         <EVENT_ID>106</EVENT_ID>
         <LINE_NUMBER>1</LINE_NUMBER>
         <INVOICE_NUMBER>24444</INVOICE_NUMBER>
         <PLANT>0003</PLANT>
         <ALLOCATION_AMOUNT>122</ALLOCATION_AMOUNT>
      </RecordLine>
   </Header>
   <Header>
      <EVENT_ID>108</EVENT_ID>
      <LINE_NUMBER>0</LINE_NUMBER>
      <INVOICE_NUMBER>24535</INVOICE_NUMBER>
      <INVOICE_DATE>2015-02-19 00:00:00.0</INVOICE_DATE>
      <CURRENCY_CODE>USD</CURRENCY_CODE>
      <TOTAL_AMOUNT_NET>11</TOTAL_AMOUNT_NET>
      <RO_NUMBER>102811</RO_NUMBER>
      <RecordLine>
         <EVENT_ID>108</EVENT_ID>
         <LINE_NUMBER>1</LINE_NUMBER>
         <INVOICE_NUMBER>24535</INVOICE_NUMBER>
         <PLANT>0002</PLANT>
         <ALLOCATION_AMOUNT>11</ALLOCATION_AMOUNT>
      </RecordLine>
   </Header>
   <Header>
      <EVENT_ID>109</EVENT_ID>
      <LINE_NUMBER>0</LINE_NUMBER>
      <INVOICE_NUMBER>24458</INVOICE_NUMBER>
      <INVOICE_DATE>2015-02-09 00:00:00.0</INVOICE_DATE>
      <CURRENCY_CODE>USD</CURRENCY_CODE>
      <TOTAL_AMOUNT_NET>0011</TOTAL_AMOUNT_NET>
      <RO_NUMBER>102813</RO_NUMBER>
      <RecordLine>
         <EVENT_ID>109</EVENT_ID>
         <LINE_NUMBER>1</LINE_NUMBER>
         <INVOICE_NUMBER>24458</INVOICE_NUMBER>
         <PLANT>0003</PLANT>
         <ALLOCATION_AMOUNT>11.1</ALLOCATION_AMOUNT>
      </RecordLine>
   </Header>
   <Header>
      <EVENT_ID>171</EVENT_ID>
      <LINE_NUMBER>0</LINE_NUMBER>
      <INVOICE_NUMBER>24645</INVOICE_NUMBER>
      <INVOICE_DATE>2015-02-28 00:00:00.0</INVOICE_DATE>
      <CURRENCY_CODE>USD</CURRENCY_CODE>
      <TOTAL_AMOUNT_NET>999999</TOTAL_AMOUNT_NET>
      <RO_NUMBER>103063</RO_NUMBER>
      <RecordLine>
         <EVENT_ID>171</EVENT_ID>
         <LINE_NUMBER>1</LINE_NUMBER>
         <INVOICE_NUMBER>24645</INVOICE_NUMBER>
         <PLANT>0001</PLANT>
         <ALLOCATION_AMOUNT>11.47</ALLOCATION_AMOUNT>
      </RecordLine>
      <RecordLine>
         <EVENT_ID>171</EVENT_ID>
         <LINE_NUMBER>2</LINE_NUMBER>
         <INVOICE_NUMBER>24645</INVOICE_NUMBER>
         <PLANT>0001</PLANT>
         <ALLOCATION_AMOUNT>11.53</ALLOCATION_AMOUNT>
      </RecordLine>
   </Header>
</ns:MT_ActualCostPreNormalized>

Working Example

flat XML 到使用 XSLT 嵌套

flat XML to nested using XSLT

xml

xslt-2.0

xslt-grouping