diff --git a/metadata.xsl b/metadata.xsl
index 44fcfe3..96490d2 100644
--- a/metadata.xsl
+++ b/metadata.xsl
@@ -93,7 +93,7 @@
       <xsl:text>, &#x20;</xsl:text>
      </xsl:if>
     </xsl:for-each>
-    <xsl:if test="contributor">
+    <xsl:if test="f:contributor">
      <xsl:text>&#x20;with contributions from&#x20;</xsl:text>
      <xsl:for-each select="f:contributor">
       <xsl:apply-templates />
diff --git a/tree.xsl b/tree.xsl
index 132ecd1..448aa08 100644
--- a/tree.xsl
+++ b/tree.xsl
@@ -100,7 +100,7 @@
   </xsl:template>
 
   <xsl:template match="f:mainmatter">
-    <div class="f:tree-content">
+    <div class="tree-content">
       <xsl:apply-templates />
     </div>
   </xsl:template>