Howto optionally include an attribute on an element in a JSP document ?

I cannot find a way to optionally include an attribute on an element in a JSP document (JSPX). My JSP document is used to create an XML according to an XML schema where some element are declared as optional by the schema (default for element attributes).
I've tried:
a)
<elem <c:if test="${!empty obj.attr}">attr=${obj.attr}</c:if>>
</elem>b)
<jsp:element name="elem">
   <c:if test="${!empty obj.attr}">
      <jsp:attribute name="attr">${obj.attr}</jsp:attribute>
   </c:if>
   <jsp:body>
   </jsp:body>
</jsp:element>And none of them work. Any ideas?

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