transcript stored in variable

usas-annotation/insert-usas-annotations.xsl

@@ -45,8 +45,9 @@
     <xsl:template match="/">
         <xsl:for-each select="distinct-values($wmatrix-utterances//*:u/@file-ref)"> 
             <xsl:variable name="file-ref" select="." as="xs:string"/>
+            <xsl:variable name="doc" select="document($file-ref)"/>
             <!-- overwrite the document -->
-            <xsl:for-each select="document($file-ref)">
+            <xsl:for-each select="$doc">
                <xsl:result-document href="{$file-ref}">
                       <xsl:apply-templates/>
                </xsl:result-document>