XML Schema for same element name with different attributes and elements - xslt

Question

I'm trying to make an XML Schema - for what's in my opinion a difficult structure. Let's say I have these XML members within a'members'-tag.
<member name="any_name" tab="any_tab" class="any_class">
<summary>Summary</summary>
</member>
and
<member name="any_name" tab="any_tab">
<type class="class_name">
<member name="Name">
<summary>Summary</summary>
</member>
</type>
</member>
Only the name-attribute of a member is required in this context.
I want to be able to validate both of these structures. To do so, I tried to define two complexType's:
<xs:complexType name="normalmember">
<xs:sequence>
<xs:element name="summary" minOccurs="1" />
</xs:sequence>
<xs:attribute type="xs:string" name="name" use="required"/>
<xs:attribute type="xs:string" name="tab" use="optional"/>
<xs:attribute type="xs:string" name="class" use="optional"/>
</xs:complexType>
and
<xs:complexType name="typemember">
<xs:sequence>
<xs:element ref="typememberinfo" />
</xs:sequence>
<xs:attribute type="xs:string" name="class" use="required" />
</xs:complexType>
My problem is that I can't define two 'member' elements with different types in the same scope:
<xs:element name="members">
<xs:complexType>
<xs:sequence>
<xs:element name="member" type="normalmember"></xs:element>
<xs:element name="member" type="typemember"></xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
How can I make an XML-Schema which is able to validate both structures?

Answer 1

This is not possible this rule is called "Element Declarations Consistent".
The Element Declarations Consistent rule for model groups
(http://www.w3.org/TR/xmlschema-1/#cos-element-consistent) rules out
inconsistent element declarations like the following two conflicting
definitions of element , i.e., cannot be both an "int" and a
"string" in the same group:
(example-1)
<xs:complexType name="example-1">
<xs:sequence>
<xs:element name="a" type="xs:int"/>
<xs:element name="whatever"/>
<xs:element name="a" type="xs:string"/>
</xs:sequence>
</xs:complexType>