ID refs

Dear all,
?
I'm having trouble in making?a particular operation?with xsl
I have the following XML:
?
?
<Specification_expression id="specification_expression-1">
??????<id>teste</id>
????? <description>teste</description>
????? <operation>or_operator</operation>
????? <operand>
?????????? <sos ref="sos-1"/>
????? </operand>
?</Specification_expression>
??
?<sos id="sos-1">
??<Specification ref="specification-7"/>
?</sos>
?
?
and I'm trying to obtain the following:
?
?
<Specification_expression id="specification_expression-1">
???????<id>teste</id>
???????<description>teste</description>
?????? <operation>or_operator</operation>
???????<operand>
??????????? <sos>
???????????????? <Specification ref="specification-7"/>
??????????? </sos>
?????? </operand>
?</Specification_expression>
?
?
?
Thanks in advance, 
?
Ricardo Saraiva.




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