| Elements | ani:mainterm, ani:sublink | 
<xs:attribute name="weight" default="b"> <xs:simpleType> <xs:restriction base="xs:token"> <xs:enumeration value="a"/> <xs:enumeration value="b"/> </xs:restriction> </xs:simpleType> </xs:attribute>  | 
                           
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                                     < descriptor xmlns = "http://www.elsevier.com/xml/ani/ani" >  | 
                              
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                                     laparoscopic right hepatectomy  | 
                              
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                                     </ mainterm>  | 
                              
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                                     </ descriptor>  |