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Asked: 2026-05-14T20:41:24+00:00

I have two documents that I need to merge, that happen in a way

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I have two documents that I need to merge, that happen in a way that I don’t seem to be able to find covered in other examples. Namely, that it needs to match not only on a node’s attribute at one level, but also on the value of an attribute a node level below that, to get that node’s value.

I’m trying to take this sample:

<?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>

And when the value of “datafield” ‘035’, “subfield” ‘a’ matches e.g. “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>

The result should be:

<?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>

I’ve tried using examples that I’ve found that did lookups, but none of them seemed to work. I didn’t include any of my XSL, because all of my results were disasterous. I keep looking at it, like it must be simple, but I’m just not getting any decent results. Any help or pointers would be greatly appreciated.

Thanks!

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1 Answer

  1. Editorial Team

    I think I have an answer for you. It’s not the most elegant but it works. Basically, you run the stylesheet against one of the XML files you are trying to merge and then you use the document function to gain access to the other XML file. Iterate through each record in the first XML file and find the matching point. Then iterate through the second document and find the matching record and pull the appropriate nodes in.

    <?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>

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