<xsd:element name="Win32"> <xsd:complexType> <xsd:attribute name="Compiler" type="xsd:string" use="optional" default="mingw32-gcc-sjlj"/> <xsd:attribute name="CFLAGS" type="xsd:string" use="required"/> <xsd:attribute name="Linker" type="xsd:string" use="optional" default="mingw32-g++-sjlj"/> <xsd:attribute name="LDFLAGS" type="xsd:string" use="required"/> </xsd:complexType> </xsd:element>