我正在使用solr-8.8。我有一个xml数据，希望将其导入solr索引。我正在使用 curl "http://<host_name>:8983/solr/<core_name>/update?commit=true&tr=updateXSLDatasource1.xsl" -H "Content-Type: text/xml" --data-binary @data1.xml 导入我的数据。以下是我的数据：

<OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd">
<responseDate>2021-06-29T14:39:46Z</responseDate>
<request verb="ListRecords" metadataPrefix="oai_dc" set="p15869coll19" from="2020-09-01" until="2020-09-30">http://digital.americanancestors.org/oai/oai.php</request>
<ListRecords>
    <record>
        <header>
            <identifier>oai:digital.americanancestors.org:p15869coll19/17</identifier>
            <datestamp>2020-09-21</datestamp>
            <setSpec>p15869coll19</setSpec>
        </header>
        <metadata>
            <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
                <dc:title>Papers of Abraham C. Ratshesky</dc:title>
                <dc:identifier>P-586</dc:identifier>
                <dc:relation>01</dc:relation>
                <dc:relation>01</dc:relation>
                <dc:subject>Halifax Explosion, Halifax, N.S. 1917; Massachusetts, General Court. Senate; American Red Cross. Boston Metropolitan Chapter</dc:subject>
                <dc:description>Photographs; Morse Family</dc:description>
                <dc:rights>Open access</dc:rights>
                <dc:rights>User has an obligation to determine copyright or other use restrictions prior to publication or distribution. Please contact the archives at jhcreference@nehgs.org or 617-226-1245 for more information.</dc:rights>
                <dc:language>English</dc:language>
                <dc:source>Wyner Family Jewish Heritage Center, New England Historic Genealogical Society</dc:source>
                <dc:identifier>http://digital.americanancestors.org/cdm/ref/collection/p15869coll19/id/17</dc:identifier>
            </oai_dc:dc>
        </metadata>
    </record>
   </ListRecords>
  </OAI-PMH>

这里是我的xslt文件（使用saxon 9.5.1.6 he引擎生成的xsl）：

<?xml version="1.0" encoding="UTF-8" ?>
 <xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0"
xpath-default-namespace="http://www.openarchives.org/OAI/2.0/"
xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
exclude-result-prefixes="oai_dc dc">

<xsl:output method="xml" doctype-public="XSLT-compat" omit-xml-declaration="yes" encoding="UTF-8" indent="yes"/>

<xsl:template match="/">
    <xsl:element name="add">
        <xsl:apply-templates select="OAI-PMH/ListRecords/record"/>
    </xsl:element>
</xsl:template>

<xsl:template match="OAI-PMH/ListRecords/record">
    <xsl:element name="doc">
        <xsl:element name="field">
            <xsl:attribute name="name">id</xsl:attribute>
            <xsl:value-of select="header/identifier"/>
        </xsl:element>
        <xsl:element name="field">
            <xsl:attribute name="name">tcngrams_title</xsl:attribute>
            <xsl:value-of select="metadata/oai_dc:dc/dc:title"/>
        </xsl:element>
        <!--  <field name="tcngrams_content">
              <xsl:variable name="description" select="metadata/oai_dc:dc/dc:description"/>
              <xsl:variable name="subject" select="metadata/oai_dc:dc/dc:subject"/>
              <xsl:variable name="coverage" select="metadata/oai_dc:dc/dc:coverage"/>
              <xsl:value-of
                      select="string-join(($description,$subject,$coverage),' ')"/>
          </field>-->

        <xsl:for-each select="metadata/oai_dc:dc/dc:identifier">
            <xsl:choose>
                <xsl:when test="starts-with(., 'http://')">
                    <xsl:element name="field">
                        <xsl:attribute name="name">sm_url</xsl:attribute>
                        <xsl:value-of select="replace(., 'http://', 'https://')"/>
                    </xsl:element>
                </xsl:when>
                <xsl:otherwise>
                    <xsl:if test="starts-with(., 'https://')">
                        <xsl:element name="field">
                            <xsl:attribute name="name">sm_url</xsl:attribute>
                            <xsl:value-of select="."/>
                        </xsl:element>
                    </xsl:if>
                </xsl:otherwise>
            </xsl:choose>
        </xsl:for-each>
        <xsl:element name="field">
            <xsl:attribute name="name">ds_date_created</xsl:attribute>
            <xsl:value-of select="concat(header/datestamp,'T00:00:00Z')"/>
        </xsl:element>
        <xsl:element name="field">
            <xsl:attribute name="name">ds_date_updated</xsl:attribute>
            <xsl:value-of select="concat(header/datestamp,'T00:00:00Z')"/>
        </xsl:element>
        <xsl:if test="metadata/oai_dc:dc/dc:type">
            <xsl:element name="field">
                <xsl:attribute name="name">ss_category</xsl:attribute>
                <xsl:value-of select="metadata/oai_dc:dc/dc:type"/>
            </xsl:element>
        </xsl:if>
        <xsl:element name="field">
            <xsl:attribute name="name">ss_topic</xsl:attribute>
            <xsl:for-each select="metadata/oai_dc:dc/dc:subject">
                <xsl:variable name="subject" select="normalize-space(substring-before(.,'--'))"/>

                <xsl:choose>
                    <xsl:when test="$subject">
                        <xsl:value-of select="$subject"/>
                    </xsl:when>
                    <xsl:otherwise>
                        <xsl:value-of select="normalize-space(.)"/>
                    </xsl:otherwise>
                </xsl:choose>
            </xsl:for-each>
        </xsl:element>
        <xsl:if test="metadata/oai_dc:dc/dc:creator">
            <xsl:element name="field">
                <xsl:attribute name="name">tcngrams_author_name</xsl:attribute>
                <xsl:value-of select="metadata/oai_dc:dc/dc:creator"/>
            </xsl:element>
        </xsl:if>
        <xsl:for-each select="metadata/oai_dc:dc/dc:source">
            <xsl:element name="field">
                <xsl:attribute name="name">sm_source</xsl:attribute>
                <xsl:value-of select="."/>
            </xsl:element>
        </xsl:for-each>
        <xsl:for-each select="metadata/oai_dc:dc/dc:relation">
            <xsl:element name="field">
                <xsl:attribute name="name">sm_source</xsl:attribute>
                <xsl:value-of select="."/>
            </xsl:element>
         </xsl:for-each>
        </xsl:element>
     </xsl:template>
    </xsl:stylesheet>

运行上述命令时，我收到以下错误消息：
原因：javax.xml.transform.TransformerConfiguration异常：第8行：非法属性“xpath默认命名空间”。java.xml/com.sun.org.apache.xalan.internal.xsltc.trax.transformerfactorympl.passwarningstolistener（transformerfactorympl.java:841）java.xml/com.sun.org.apache.xalan.internal.xsltc.trax.transformerfactorympl.newtemplates（transformerfactorympl.java:1037）。。。49多
出现此错误消息的原因是什么？