We have some records with 505 (Formatted Contents Note), using fields $g $t and $r instead of just $a (which is more common). Using oai_dc we had a lot of rows with `<dc:description />`. Around line 118 of /usr/share/koha/intranet/htdocs/intranet-tmpl/prog/en/xslt/MARC21slim2OAIDC.xsl we replaced <xsl:value-of select="marc:subfield[@code='a']"/> With <xsl:call-template name="subfieldSelect"> <xsl:with-param name="codes">aegtr</xsl:with-param> </xsl:call-template> To see those (and others) note subfields. Related bug 16307.