如何使用 XSL-FO(和 Apache FOP)计算从应用模板返回的元素

How to count elements returned from applied template using XSL-FO (and Apache FOP)

我想做类似于 但使用 XSL-FO 和 Apache FOP 的事情。

我有 xml 这样的输入(与链接问题中的完全一样):

<Results>
    <Result ID="0">
        <SerialNumber>3333</SerialNumber>
        <Status>Fail</Status>
        <Date>21</Date>
    </Result>
    <Result ID="1">
        <SerialNumber>1111</SerialNumber>
        <Status>Fail</Status>
        <Date>34</Date>
    </Result>
    <Result ID="2">
        <SerialNumber>1111</SerialNumber>
        <Status>Pass</Status>
        <Date>67</Date>
    </Result>
    <Result ID="3">
        <SerialNumber>2222</SerialNumber>
        <Status>Fail</Status>
        <Date>40</Date>
    </Result>
    <Result ID="4">
        <SerialNumber>1111</SerialNumber>
        <Status>Fail</Status>
        <Date>55</Date>
    </Result>
    <Result ID="5">
        <SerialNumber>1111</SerialNumber>
        <Status>Fail</Status>
        <Date>88</Date>
    </Result>
    <Result ID="6">
        <SerialNumber>2222</SerialNumber>
        <Status>Fail</Status>
        <Date>22</Date>
    </Result>
    <Result ID="7">
        <SerialNumber>1111</SerialNumber>
        <Status>Fail</Status>
        <Date>86</Date>
    </Result>
    <Result ID="8">
        <SerialNumber>3333</SerialNumber>
        <Status>Pass</Status>
        <Date>99</Date>
    </Result>
</Results>

我想创建 XSL 文件,它将生成 XSL-FO 以生成 PDF(使用 Apache FOP),我将在其中显示以下文本:

Total Quantity: 3
Passed: 1
Failed: 2

这些数字是:

换句话说,我只需要计算每个 SerialNumber 的最新 Date 结果的数量。结果未排序。

我尝试了 (当我只使用 xslt 在我的浏览器中生成 html 时有效):

<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:key name="result-by-sn" match="Result" use="SerialNumber" />

<xsl:template match="/Results">
    <xsl:variable name="temp">
        <xsl:for-each select="Result[count(. | key('result-by-sn', SerialNumber)[1]) = 1]">
            <xsl:for-each select="key('result-by-sn', SerialNumber)">
                <xsl:sort select="Date" order="descending"/>
                <xsl:if test="position()=1 and Status='Fail'">x</xsl:if>
            </xsl:for-each>
        </xsl:for-each>
    </xsl:variable>
    <output>
        <xsl:value-of select="string-length($temp)"/>
    </output>
</xsl:template>

</xsl:stylesheet>

但是 Apache FOP returns Unknown formatting object "{}output" encountered 错误。如何处理这个错误并显示我的结果摘要?


编辑:

这是我当前的 xsl 文件:

<?xml version="1.0" encoding="UTF-8"?><xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format">

<!-- KEY FOR FINDING UUT RESULTS -->
<xsl:key name="result-by-sn" match="Results/Result" use="SerialNumber"/>

    <xsl:template match="/">
        <fo:root>
            <fo:layout-master-set>
                <fo:simple-page-master master-name="my_page" margin="0.5in">
                    <fo:region-body/>
                </fo:simple-page-master>
            </fo:layout-master-set>
            <fo:page-sequence master-reference="my_page">
                <fo:flow flow-name="xsl-region-body">
                    <fo:block>Total Quantity: <xsl:value-of select="count(Results/Result[generate-id() = generate-id(key('result-by-sn', SerialNumber)[1])])"/></fo:block>
                    <fo:block>Passed: <!--<xsl:apply-templates select="Results" mode="count"><xsl:with-param name="status" select="'Pass'"/></xsl:apply-templates>--></fo:block>
                    <fo:block>Failed: <!--<xsl:apply-templates select="Results" mode="count"><xsl:with-param name="status" select="'Fail'"/></xsl:apply-templates>--></fo:block>
                </fo:flow>
            </fo:page-sequence>
        </fo:root>
    </xsl:template>

<!-- TEMPLATE TO COUNT RESULTS -->
<!--<xsl:template match="Results" mode="count">
    <xsl:param name="status" select="'Pass'"/>
    <xsl:variable name="temp">
        <xsl:for-each select="Result[generate-id()=generate-id(key('result-by-sn', SerialNumber)[1])]">
            <xsl:for-each select="key('result-by-sn', SerialNumber)">
                <xsl:sort select="Date" order="descending"/>
                <xsl:if test="position() = 1 and  Status = $status">x</xsl:if>
            </xsl:for-each>
        </xsl:for-each>
    </xsl:variable>
    <output>
        <xsl:value-of select="string-length($temp)"/>
    </output>
</xsl:template>-->

</xsl:stylesheet>

因此,假设您希望 XSL 转换产生以下结果:

<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="my_page" margin="0.5in">
      <fo:region-body/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="my_page">
    <fo:flow flow-name="xsl-region-body">
      <fo:block>Total Quantity: 3</fo:block>
      <fo:block>Passed: 1</fo:block>
      <fo:block>Failed: 2</fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>

您可以使用以下样式表:

XSLT 1.0

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

<xsl:key name="result-by-sn" match="Result" use="SerialNumber" />

<xsl:template match="/Results">
    <!-- determine counts -->
    <xsl:variable name="distinct-results" select="Result[count(. | key('result-by-sn', SerialNumber)[1]) = 1]" />
    <xsl:variable name="count-distinct" select="count($distinct-results)" />
    <xsl:variable name="fails">
        <xsl:for-each select="$distinct-results">
            <xsl:for-each select="key('result-by-sn', SerialNumber)">
                <xsl:sort select="Date" order="descending"/>
                <xsl:if test="position()=1 and Status='Fail'">F</xsl:if>
            </xsl:for-each>
        </xsl:for-each>
    </xsl:variable>
    <xsl:variable name="count-fails" select="string-length($fails)" />
    <!-- output -->
    <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
        <fo:layout-master-set>
            <fo:simple-page-master master-name="my_page" margin="0.5in">
                <fo:region-body/>
            </fo:simple-page-master>
        </fo:layout-master-set>
        <fo:page-sequence master-reference="my_page">
            <fo:flow flow-name="xsl-region-body">
                <fo:block>
                    <xsl:text>Total Quantity: </xsl:text>
                    <xsl:value-of select="$count-distinct"/>
                </fo:block>
                <fo:block>
                    <xsl:text>Passed: </xsl:text>
                    <xsl:value-of select="$count-distinct - $count-fails"/>
                </fo:block>
                <fo:block>
                    <xsl:text>Failed: </xsl:text>
                    <xsl:value-of select="$count-fails"/>
                </fo:block>
            </fo:flow>
        </fo:page-sequence>
    </fo:root>
</xsl:template>

</xsl:stylesheet>