将相似的 XML 文件与 XSL 合并时出现问题

Question

我有两个需要合并的文档，它们的发生方式在其他示例中似乎无法找到。即，它不仅需要匹配上一级节点的属性，还需要匹配低于该节点级别的属性值，以获得该节点的值。

我正在尝试取样：

<?xml version="1.0" encoding="UTF-8" ?>
<marc:collection xmlns:marc="http://www.loc.gov/MARC21/slim"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <marc:record>
    <marc:datafield tag="035" ind1=" " ind2=" ">
        <marc:subfield code="a">12345</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="041" ind1=" " ind2=" ">
        <marc:subfield code="a">eng</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="650" ind1=" " ind2="4">
        <marc:subfield code="a">Art</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="949" ind1=" " ind2=" ">
        <marc:subfield code="i">Review of conference proceedings</marc:subfield>
    </marc:datafield>
  </marc:record>
  <marc:record>
    <marc:datafield tag="035" ind1=" " ind2=" ">
        <marc:subfield code="a">54321</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="041" ind1=" " ind2=" ">
        <marc:subfield code="a">eng</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="650" ind1=" " ind2="4">
        <marc:subfield code="a">Byzantine</marc:subfield>
    </marc:datafield>
  </marc:record>
</marc:collection>

当 "datafield" '035', "subfield" 'a' 的值匹配时，例如“12345”

<marc:collection xmlns:marc="http://www.loc.gov/MARC21/slim"
xmlns:fn="http://www.w3.org/2005/xpath-functions" xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <marc:record>
    <marc:datafield ind2=" " ind1=" " tag="035">
        <marc:subfield code="a">12345</marc:subfield>
    </marc:datafield>
    <marc:datafield ind2="4" ind1=" " tag="650">
        <marc:subfield code="a">General works</marc:subfield>
        <marc:subfield code="x">Historians and critics</marc:subfield>
        <marc:subfield code="x">Smith, John, 1834-1917</marc:subfield>
    </marc:datafield>
    <marc:datafield ind2="4" ind1=" " tag="650">
        <marc:subfield code="a">Généralités</marc:subfield>
        <marc:subfield code="x">Historiens et critiques d'art</marc:subfield>
        <marc:subfield code="x">Dietrichson, Lorentz, 1834-1917</marc:subfield>
    </marc:datafield>
    <marc:datafield ind2=" " ind1=" " tag="654">
        <marc:subfield code="a">General works</marc:subfield>
    </marc:datafield>
    <marc:datafield ind2=" " ind1=" " tag="654">
        <marc:subfield code="a">Généralités</marc:subfield>
        <marc:subfield code="b">Historiens et critiques d'art</marc:subfield>
        <marc:subfield code="b">Smith, John, 1834-1917</marc:subfield>
    </marc:datafield>
  </marc:record>      
  <marc:record>
    <marc:datafield ind2=" " ind1=" " tag="035">
        <marc:subfield code="a">54321</marc:subfield>
    </marc:datafield>
    <marc:datafield ind2="4" ind1=" " tag="650">
        <marc:subfield code="a">General works</marc:subfield>
        <marc:subfield code="x">Historians and critics</marc:subfield>
        <marc:subfield code="x">Lange, Julius Henrik, 1838-1896</marc:subfield>
    </marc:datafield>
  </marc:record>
</marc:collection>

结果应该是：

<?xml version="1.0" encoding="UTF-8" ?>
<marc:collection xmlns:marc="http://www.loc.gov/MARC21/slim"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <marc:record>
    <marc:datafield tag="035" ind1=" " ind2=" ">
        <marc:subfield code="a">12345</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="041" ind1=" " ind2=" ">
        <marc:subfield code="a">eng</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="650" ind1=" " ind2="4">
        <marc:subfield code="a">Art</marc:subfield>
    </marc:datafield>
    <marc:datafield ind2="4" ind1=" " tag="650">
        <marc:subfield code="a">General works</marc:subfield>
        <marc:subfield code="x">Historians and critics</marc:subfield>
        <marc:subfield code="x">Smith, John, 1834-1917</marc:subfield>
    </marc:datafield>
    <marc:datafield ind2="4" ind1=" " tag="650">
        <marc:subfield code="a">Généralités</marc:subfield>
        <marc:subfield code="x">Historiens et critiques d'art</marc:subfield>
        <marc:subfield code="x">Dietrichson, Lorentz, 1834-1917</marc:subfield>
    </marc:datafield>
    <marc:datafield ind2=" " ind1=" " tag="654">
        <marc:subfield code="a">General works</marc:subfield>
    </marc:datafield>
    <marc:datafield ind2=" " ind1=" " tag="654">
        <marc:subfield code="a">Généralités</marc:subfield>
        <marc:subfield code="b">Historiens et critiques d'art</marc:subfield>
        <marc:subfield code="b">Smith, John, 1834-1917</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="949" ind1=" " ind2=" ">
        <marc:subfield code="i">Review of conference proceedings</marc:subfield>
    </marc:datafield>
  </marc:record>
  <marc:record>
    <marc:datafield tag="035" ind1=" " ind2=" ">
        <marc:subfield code="a">54321</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="041" ind1=" " ind2=" ">
        <marc:subfield code="a">eng</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="650" ind1=" " ind2="4">
        <marc:subfield code="a">Byzantine</marc:subfield>
    </marc:datafield>
    <marc:datafield ind2="4" ind1=" " tag="650">
        <marc:subfield code="a">General works</marc:subfield>
        <marc:subfield code="x">Historians and critics</marc:subfield>
        <marc:subfield code="x">Lange, Julius Henrik, 1838-1896</marc:subfield>
    </marc:datafield>
  </marc:record>
</marc:collection>

我尝试使用我发现的可以进行查找的示例，但它们似乎都不起作用。我没有包含任何 XSL，因为我的所有结果都是灾难性的。我一直在看它，好像它一定很简单，但我只是没有得到任何体面的结果。任何帮助或指点将不胜感激。

谢谢！

Answer 1

以下解决方案使用键在合并文档中进行高效查找。假设应复制除匹配的datafield 之外的所有datafield 元素，并且每个record 最多有一个匹配的datafield。应该合并的文档的 URL 作为参数传递。

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:marc="http://www.loc.gov/MARC21/slim">
    <xsl:output method="xml" indent="yes"/>
    <xsl:param name="mergeFile"/>
    <xsl:variable name="mergeDoc" select="document($mergeFile)"/>

    <xsl:key name="datafield" match="marc:datafield" 
        use="concat(@tag, '|', marc:subfield[@code='a'])"/>

    <xsl:template match="/">
        <xsl:apply-templates select="node()|@*"/>
    </xsl:template>

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

    <xsl:template match="marc:record">
        <xsl:copy>
            <xsl:apply-templates select="node()|@*"/>
            <xsl:apply-templates select="marc:datafield" mode="merge"/>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="marc:datafield" mode="merge">
        <xsl:variable name="datafieldKey" 
                      select="concat(@tag, '|', marc:subfield[@code='a'])"/>
        <!-- Make the other document the context node with for-each, so that
             key lookups will consult that document instead of the source 
             document. -->
        <xsl:for-each select="$mergeDoc">
            <xsl:for-each select="key('datafield', $datafieldKey)">
                <xsl:copy-of select="preceding-sibling::*"/>
                <xsl:copy-of select="following-sibling::*"/>
            </xsl:for-each>
        </xsl:for-each>
    </xsl:template>

</xsl:stylesheet>

Answer 2

我想我有一个答案给你。它不是最优雅的，但它确实有效。基本上，您针对您尝试合并的一个 XML 文件运行样式表，然后使用文档函数来访问另一个 XML 文件。遍历第一个 XML 文件中的每条记录并找到匹配点。然后遍历第二个文档，找到匹配的记录，把合适的节点拉进去。

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

<xsl:variable name="doc2" select="document('FourBabyMarcs.xml')"/>

<xsl:template match="/">
    <marc:collection>
        <xsl:for-each select="marc:collection/marc:record">
            <marc:record>

                <xsl:for-each select="marc:leader">
                    <xsl:copy-of select="."/>
                </xsl:for-each>

                <xsl:for-each select="marc:controlfield">
                    <xsl:copy-of select="."/>
                </xsl:for-each>

                <xsl:for-each select="marc:datafield">
                    <xsl:copy-of select="."/>
                </xsl:for-each>

                <xsl:variable name="ID">
                    <xsl:value-of select="marc:datafield[@tag='035']/marc:subfield[@code='a']"/>
                </xsl:variable>

                <xsl:for-each select="$doc2/*/marc:record">
                        <xsl:if test="marc:datafield[@tag='035']/marc:subfield[@code='a']=$ID">
                            <xsl:for-each select="marc:datafield">
                                <xsl:if test="@tag='650'">
                                    <xsl:copy-of select="."/>
                                </xsl:if>
                                <xsl:if test="@tag='654'">
                                    <xsl:copy-of select="."/>
                                </xsl:if>
                            </xsl:for-each>
                        </xsl:if>
                </xsl:for-each>
            </marc:record>
        </xsl:for-each>
    </marc:collection>
</xsl:template>