+ <xsl:variable name="title_medium" select="marc:datafield[@tag='245']/marc:subfield[@code='h']"/>
+ <xsl:variable name="journal_title" select="marc:datafield[@tag='773']/marc:subfield[@code='t']"/>
+ <xsl:variable name="electronic_location_url" select="marc:datafield[@tag='856']/marc:subfield[@code='u']"/>
+ <xsl:variable name="fulltext_a" select="marc:datafield[@tag='900']/marc:subfield[@code='a']"/>
+ <xsl:variable name="fulltext_b" select="marc:datafield[@tag='900']/marc:subfield[@code='b']"/>
+ <xsl:variable name="medium">
+ <xsl:choose>
+ <xsl:when test="$title_medium">
+ <xsl:value-of select="substring-after(substring-before($title_medium,']'),'[')"/>
+ </xsl:when>
+ <xsl:when test="$fulltext_a">
+ <xsl:text>electronic resource</xsl:text>
+ </xsl:when>
+ <xsl:when test="$fulltext_b">
+ <xsl:text>electronic resource</xsl:text>
+ </xsl:when>
+ <xsl:when test="$electronic_location_url">
+ <xsl:text>electronic resource</xsl:text>
+ </xsl:when>
+ <xsl:when test="$journal_title">
+ <xsl:text>article</xsl:text>
+ </xsl:when>
+ <xsl:otherwise>
+ <xsl:text>book</xsl:text>
+ </xsl:otherwise>
+ </xsl:choose>
+ </xsl:variable>