xml - If one of the attributes is present then another should be required else both must be optional -

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Assume that I have followed the content in the XML: 

  & lt; Size type = "rectangle" font size = "14.11" width = "10" height = "5" /> & Lt; Shape type = "rounded length" font size = "16" /> & Lt; Size type = "circle" font size = "12" /> & Lt; Shape type = "roundedcutangel" font size = "11" width = "10" height = "5" /> I want to create an XSD which validates that if "width" exists as a feature, then that element should have "height" and vice versa.   
 
 
 xsd 1.0  
 should be done in the code.  
 XSD 1.1  
 can be done by one:  
   & Lt; Xs: attribute name = "width" type = "x :: int" /> & Lt; Xs: test = "(@ height and @wide) or (not (@hite) and no (@with))" /> & lt; / XS: complexType & gt; & Lt; / XS: element & gt; & Lt; / XS: Schema & gt;

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