Question about the unique element declaration inside the model groups

I meet a case when I do the schema testing, which as the following:

 

<xs:schema> 

         <xs:complexType name="One">

                   <xs:sequence>

                     <xs:element name="elem1" type="xs:string"
fixed="abc"/>

                     <xs:element name="elem1" type="xs:string"
fixed="123"/>

                   </xs:sequence>

         </xs:complexType>

</xs:schema>

 

There are two elements with the same name "elem1" and the same target
namespace

inside the <xs:sequence>. Is this allowed? 

 

I read the spec and get the description which says: 

3.15.6 Constraints on Schemas as a Whole  

Schema Component Constraint: Schema Properties Correct

2 Each of the {type definitions}
<http://www.w3.org/TR/xmlschema-1/#type_definitions#type_definitions> ,
{element declarations}
<http://www.w3.org/TR/xmlschema-1/#element_declarations#element_declarat
ions> , {attribute group definitions}
<http://www.w3.org/TR/xmlschema-1/#attribute_group_definitions#attribute
_group_definitions> , 

{model group definitions}
<http://www.w3.org/TR/xmlschema-1/#model_group_definitions#model_group_d
efinitions>  and {notation declarations}
<http://www.w3.org/TR/xmlschema-1/#notation_declarations#notation_declar
ations>  must not contain two or more 

schema components with the same {name} and {target namespace}.

 

I think this case violate this rule. However, I test it with many schema
validation tools and get the report that

"This case is correct".  Someone can give me an answer about it? 

 

Thanks and Regards,
- Wang Zhuo    

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