The extra element may contain an asset element. | 
                           

<xs:element name="asset" type="asset_type" minOccurs="0"> <xs:annotation> <xs:documentation>The extra element may contain an asset element.</xs:documentation> </xs:annotation> </xs:element>  | 
                           
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                                     < asset xmlns = "http://www.collada.org/2008/03/COLLADASchema" >  | 
                              
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                                     < contributor>  | 
                              
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                                     < author/>  | 
                              
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                                     RenderMonkey  | 
                              
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                                     </ authoring_tool>  | 
                              
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                                     < comments>  | 
                              
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                                     Output from RenderMonkey COLLADA Exporter  | 
                              
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                                     </ comments>  | 
                              
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                                     < copyright/>  | 
                              
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                                     < source_data/>  | 
                              
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                                     </ contributor>  | 
                              
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                                     < created>  | 
                              
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                                     2008-03-27T20:31:16Z  | 
                              
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                                     </ created>  | 
                              
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                                     < modified>  | 
                              
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                                     2008-03-27T20:31:16Z  | 
                              
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                                     </ modified>  | 
                              
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                                     < up_axis>  | 
                              
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                                     Y_UP  | 
                              
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                                     </ up_axis>  | 
                              
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                                     </ asset>  |