create_sorts.xsl

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:foxml="info:fedora/fedora-system:def/foxml#"
                xmlns:mods="http://www.loc.gov/mods/v3"
                xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/"
                xmlns:dc="http://purl.org/dc/elements/1.1/"
                exclude-result-prefixes="foxml mods"
                version="1.0">

    <xsl:template match="foxml:datastream[@ID='MODS']/foxml:datastreamVersion[last()]" name="SORTS">
        <xsl:param name="content"/>
        <xsl:apply-templates mode="mods_sorts" select="$content/mods:mods" />
    </xsl:template>

    <xsl:template match="mods:mods/mods:name[1]" mode="mods_sorts">
        <field>
            <xsl:attribute name="name">creator_sort</xsl:attribute>
            <xsl:value-of select="mods:namePart" />
        </field>
    </xsl:template>

    <xsl:template match="mods:originInfo" mode="mods_sorts">
        <xsl:choose>
            <xsl:when test="mods:dateIssued" >
                <field>
                    <xsl:attribute name="name">date_sort</xsl:attribute>
                    <xsl:value-of select="mods:dateIssued" />
                </field>
            </xsl:when>
            <xsl:when test="mods:dateCreated">
                <field>
                    <xsl:attribute name="name">date_sort</xsl:attribute>
                    <xsl:value-of select="mods:dateCreated" />
                </field>
            </xsl:when>
            <xsl:when test="mods:dateOther">
                <field>
                    <xsl:attribute name="name">date_sort</xsl:attribute>
                    <xsl:value-of select="mods:dateOther" />
                </field>
            </xsl:when>
            <xsl:otherwise>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:template>


    <xsl:template match="mods:mods/mods:titleInfo[not(@type)]" mode="mods_sorts">
        <field>
            <xsl:attribute name="name">title_sort</xsl:attribute>
            <xsl:value-of select="mods:title" />
        </field>
    </xsl:template>
    
    <xsl:template match="text()" mode="mods_sorts"/>
    
</xsl:stylesheet>