Modifica a apresentação de xref[@ref-type="bibr"] (python3) (#520)

packtools/catalogs/htmlgenerator/v3.0/article-text-xref.xsl

@@ -93,7 +93,7 @@
         <xsl:variable name="id"><xsl:value-of select="@rid"/></xsl:variable>
         <xsl:variable name="text"><xsl:apply-templates select=".//text()"/></xsl:variable>
         <xsl:variable name="elem"><xsl:choose>
-            <xsl:when test="contains('1234567890',substring(normalize-space($text),1,1))">sup</xsl:when>
+            <xsl:when test="$article//ref/label">sup</xsl:when>
             <xsl:otherwise>span</xsl:otherwise>
         </xsl:choose></xsl:variable>
         <!--