Error : XSL map generation failed

Question

I am trying to map two XSD and generate the XSL file which will transform from one xml to another.
Source XML
+<root>+
+<Hello>Well</Hello>+
+<World>Thats</World>+
+</root>+
Destination XML
+<root>+
+<property name="Consumer" value="Well"/>+
+<property name="Consumer" value="Thats"/>+
+</root>+
Since the the destination XSD has same element twice, in its XSD it appears only once. So there only one node in the XSL Map tree in the right side of the JDeveloper (version 11.1.1.5.0)
I can only drag lines from either <hello> or <world> from the 1st XSD to the <property> element of the second XSD.
When I changed the XML map's xsl source to match my requirement as follows
     +<xsl:template match="/">+
          +<root>+
          +<ns0:property>+
               +<xsl:attribute name="name">+
                    +<xsl:text disable-output-escaping="no">Consumer</xsl:text>+
               +</xsl:attribute>+
               +<xsl:attribute name="value">+
                    +<xsl:value-of select="/root/Hello"/>+
               +</xsl:attribute>+
          +</ns0:property>+
          +<ns0:property>+
               +<xsl:attribute name="name">+
                    +<xsl:text disable-output-escaping="no">Consumer</xsl:text>+
               +</xsl:attribute>+
               +<xsl:attribute name="value">+
                    +<xsl:value-of select="/root/World"/>+
               +</xsl:attribute>+
          +</ns0:property>+
          +</root>+
     +</xsl:template>+
+</xsl:stylesheet>+
It works when I test the xsl but I can not go back to the design mode, it is showing the following error
Error : XSL map generation failed
Error: This node is already mapped, repeating nodes not supported :
I am not able to map (drag lines) any more due this error. Please suggest how to create repeating nodes in the destination XSD
Edited by: neilghoshidc on May 21, 2012 6:53 PM

Answer 1

The XSL Map error is only in Design mode. Runtime shouldn't generate an error.
Also refer
Notes on the Mapper
http://docs.oracle.com/cd/B31017_01/integrate.1013/b28211/xslt_mpr.htm
When you map duplicate elements in the XSLT Mapper, the style sheet becomes invalid and you cannot work in the Design view. The Log Window shows the following error messages when you map an element with a duplicate name:
Error: This Node is Already Mapped  :
+"/ns0:rulebase/for-each/ns0:if/ns0:atom/ns0:rel"+
Error: This Node is Already Mapped  :
+"/ns0:rulebase/for-each/ns0:if/ns0:atom/choice_1/ns0:ind"+
Error: This Node is Already Mapped  :
+"/ns0:rulebase/for-each/ns0:if/ns0:atom/choice_1/ns0:var"+
The workaround is to give each element a unique name.