XSLT-template in question: intranet/htdocs/intranet-tmpl/prog/en/xslt/MARC21slimUtils.xsl Field 810$t is used to populate a search query, so it looks pretty important: <a><xsl:attribute name="href"><xsl:value-of select="$searchurl"/>?q=se,phr:"<xsl:value-of select="str:encode-uri(marc:subfield[@code='t'], true())"/>"&q=au:"<xsl:value-of select="str:encode-uri(marc:subfield[@code='a'], true())"/>"</xsl:attribute>
Created attachment 170755 [details] [review] Bug 37743 - MARC21 810$t is used in XSLT templates but is not editable by default. XSLT-template in question: intranet/htdocs/intranet-tmpl/prog/en/xslt/MARC21slimUtils.xsl Field is used to populate a search query, so it looks pretty important: <a><xsl:attribute name="href"><xsl:value-of select="$searchurl"/>?q=se,phr:"<xsl:value-of select="str:encode-uri(marc:subfield[@code='t'], true())"/>"&q=au:"<xsl:value-of select="str:encode-uri(marc:subfield[@code='a'], true())"/>"</xsl:attribute>
See also Bug 37744
I think we have some discrepancies between visibility in frameworks and XSLT. It would be good to fix them (I think I did a while ago something similar for subfields of 773)