Oracle XSLT:namespace padrão resulta em tags vazias

Esta transformação :

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:s="http://www.mycompany.com/schema"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns="http://www.mycompany.com/def_schema"
 >
 <xsl:output omit-xml-declaration="yes" indent="yes"/>

 <xsl:template match="/*">
  <r>
   <xsl:apply-templates/>
  </r>
 </xsl:template>

 <xsl:template match="DATA_A">
  <a>
   <xsl:apply-templates/>
  </a>
 </xsl:template>

  <xsl:template match="OTHER_DATA_C">
   <c>
    <xsl:apply-templates/>
   </c>
  </xsl:template>

  <xsl:template match="DATA_B">
   <s:b>
    <xsl:apply-templates/>
   </s:b>
  </xsl:template>
</xsl:stylesheet>

quando aplicado no documento XML fornecido :

<ROOT_NODE>
    <DATA_A>1234</DATA_A>
    <DATA_B>34567</DATA_B>
    <OTHER_DATA_C>7.123456</OTHER_DATA_C>
</ROOT_NODE>

produz o resultado desejado :

<r xmlns:s="http://www.mycompany.com/schema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.mycompany.com/def_schema">
    <a>1234</a>
    <s:b>34567</s:b>
    <c>7.123456</c>
</r>