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I believe that 3.10.3 is intended to apply to xs:anyAttribute as well as to xs:any. So it should say "In addition to the conditions imposed on <any> and <anyAttribute> element information items..." (But I might be wrong. The information relating to anyAttribute is scattered randomly among the sections for ComplexType, AttributeGroup, and Wildcard. It would be good to bring it together in one place; or at least to improve the cross-referencing.)
On 2008-10-24, the working group adopted a proposal to address this issue by - Making the suggested change - Moving "XML Representation Summary" for <anyAttribute> from 3.4 (complex type) to 3.10 (wildcard) The proposal (along with changes for other bugs) can be found at (member-only): http://www.w3.org/XML/Group/2004/06/xmlschema-1/structures.omni0810.html