Bug fix: the warning message very

clearly says that if there is more than one declared
namespace with the same URI, only the prefix of the 1st
is used. But the code didn’t actually **do** that. It
tried to use both, and thus failed miserably.

odds/extract-isosch.xsl

@@ -257,7 +257,7 @@ of this software, even if advised of the possibility of such damage.
                                   ||'; using the prefix bound in the first one, '
                                   ||'and ignoring the other(s).'"/>
             </xsl:if>
-            <xsl:sequence select="$DECLARED_NSs_with_this_uri/@prefix => normalize-space()||':'"/>
+            <xsl:sequence select="($DECLARED_NSs_with_this_uri)[1]/@prefix => normalize-space()||':'"/>
           </xsl:when>
           <xsl:when test="namespace::* = $nsu">
             <xsl:value-of select="concat( local-name( namespace::*[ . eq $nsu ][1] ), ':')"/>