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Extensions

The only purpose of simple content extensions is to add attributes to an existing base type. In this case, a C struct is generated containing a base element (_base) of the type being extended and attribute elements for the additional attributes. For C++, the attributes are added to the derived class.
The general mapping is as follows:
XSD type: 
<xsd:complexType name="TypeName">
 
   <xsd:simpleContent>
 
      <xsd:extension base="BaseType">
 
         <xsd:attribute name="attr1" type="Type1"/>
 
         <xsd:attribute name="attr2" type="Type2"/>
 
         ...
 
         <xsd:attribute name="attrN" type="TypeN"/>
 
      </xsd:extension>
 
   </xsd:simpleContent>
 
</xsd:complexType>
Generated C code:
 
typedef struct TypeName {
 
   BaseType		_base;
 

 
   /* attributes */
 
   Type1 attr1;
 
   Type2 attr2;
 
   ...
 
   TypeN attrN;
 
} TypeName;
 
Generated C++ code:
 
class TypeName : public BaseType {
 
   /* attributes */
 
   Type1 attr1;
 
   Type2 attr2;
 
   ...
 
   TypeN attrN;
 

 
   ...
 
} ;
 


In this case, BaseType can only be a built-in XSD simple type or a type that references a simple type.
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