Fixed xmlclass for working with included files, adding support for SimpleType elements and solving ambiguity in extension class when different elements share the same name and parent name
<xsd:element name="Xenomai">
<xsd:complexType>
%(toolchain_gcc)s
<xsd:attribute name="XenoConfig" type="xsd:string" use="optional" default="xeno-config"/>
</xsd:complexType>
</xsd:element>