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In the section "3.10 Wildcards", there's the following line mentioned under "3.10.1 The Wildcard Schema Component", <someErrorHere> 6. ({disallowed names} contains the keyword sibling) have any expanded name other than those matching the names of element or attribute declarations in the containing complex type definition. </someErrorHere> I think, point 6. should be corrected as follows, {disallowed names} contains the keyword definedSibling ... i.e definedSibling instead of sibling. The information specified here, XML Representation Summary: any Element Information Item looks correct to me.