How to Get xml Attribute value from a given  xpath

i'm building an xml from 3 columns a,b,c using 'SELECT EXTRACT (XMLELEMENT ("ROOT",.........)'
and my xml looks something like this
<ROOT>
<categories>
<catogory value="col a value" display="true"/>
<catogory value="col b value" display="false"/>
<catogory value="col c value" display="false"/>
</categories>
<DATAS>
</DATA>
</ROOT>
now under the datas node i want to use xpath like this
(case when '/root/categories/catogory/[@display="true"]' then '/root/categories/catogory/@value' else 0 end)
so tat i get values under data node based on display attributes.... is it possible..
if not is ther any alternative way of using xpath

What version of Oracle (4 digits)?
Are you trying to populate the Data node when you are building the XML originally via your SQL/XML statement or are you talking about modifying some existing XML to add more nodes to it based on data in the XML already?

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