What you need to do is convert your XML data to a format that works better with Access. In particular, you need to insert the value of the parent key (if in this case C_NOT) into each child element of the node.
The following XSLT file will do it for you
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="/">
<dataroot>
<xsl:apply-templates select="@*|node()"/>
</dataroot>
</xsl:template>
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="NOTARIAS">
<xsl:apply-templates select="@*|node()"/>
</xsl:template>
<xsl:template match="NOTARIA">
<NOTARIA>
<C_NOT><xsl:value-of select="../../C_NOT"/></C_NOT>
<xsl:apply-templates select="@*|node()"/>
</NOTARIA>
</xsl:template>
</xsl:stylesheet>
XML ...
<NOTARIO>
<C_NOT>8404180</C_NOT>
<APE>Abalos Nuevo</APE>
<NOM>Francisco José</NOM>
<NOTARIAS>
<NOTARIA>
<PRO>23</PRO>
<MUN>0888</MUN>
<F_IN>1984-12-01</F_IN>
<F_FI>1986-09-19</F_FI>
</NOTARIA>
<NOTARIA>
<PRO>14</PRO>
<MUN>0569</MUN>
<F_IN>1990-09-17</F_IN>
<F_FI>1995-03-15</F_FI>
</NOTARIA>
<NOTARIA>
<PRO>21</PRO>
<MUN>0412</MUN>
<F_IN>1995-03-30</F_IN>
<F_FI></F_FI>
</NOTARIA>
</NOTARIAS>
</NOTARIO>
... :
<?xml version="1.0" encoding="UTF-8"?>
<dataroot>
<NOTARIO>
<C_NOT>8404180</C_NOT>
<APE>Abalos Nuevo</APE>
<NOM>Francisco José</NOM>
<NOTARIA>
<C_NOT>8404180</C_NOT>
<PRO>23</PRO>
<MUN>0888</MUN>
<F_IN>1984-12-01</F_IN>
<F_FI>1986-09-19</F_FI>
</NOTARIA>
<NOTARIA>
<C_NOT>8404180</C_NOT>
<PRO>14</PRO>
<MUN>0569</MUN>
<F_IN>1990-09-17</F_IN>
<F_FI>1995-03-15</F_FI>
</NOTARIA>
<NOTARIA>
<C_NOT>8404180</C_NOT>
<PRO>21</PRO>
<MUN>0412</MUN>
<F_IN>1995-03-30</F_IN>
<F_FI />
</NOTARIA>
</NOTARIO>
</dataroot>
... , Access .
XSLT ( "transformio.xslt" ), Access XML. , XML , ""...

... XSLT ...

"" " XML", , , C_NOT .

, , C_NOT, "" :

