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C:/app/Administrator/product/11.2.0/dbhome_1/RDBMS/xml/schema/

files >> C:/app/Administrator/product/11.2.0/dbhome_1/RDBMS/xml/schema/xmltr.xsd.11.0

 <?xml version="1.0"?>
<xs:schema targetNamespace="http://xmlns.oracle.com/xdb" 
           xmlns:xs="http://www.w3.org/2001/XMLSchema" xml:lang="en">

   <xs:attribute name="srclang" type="xs:boolean">
       <xs:annotation>
           <xs:documentation>
               This attribute determines if the translation that the element
               contains is a source language translation
           </xs:documentation>
       </xs:annotation>
    </xs:attribute>
</xs:schema>