python - How to make a complexType that extends a simpleType -

i have implement service spyne exposes specific wsdl

right i'm unable replicate definition:

<xs:complextype name="mytype">     <xs:simplecontent>         <xs:extension base="xs:string">             <xs:attribute name="version" type="xs:string"/>         </xs:extension>     </xs:simplecontent> </xs:complextype> 

so far best able achieve

class mytype(complexmodel):     __namespace__ = "uri:my-ns"     __extends__ = primitive.unicode     version = xmlattribute(primitive.unicode) 

that raise attributeerror if "patch" models/complex.py[1] obtain:

<xs:complextype name="mytype">     <xs:complexcontent>          <xs:extension base="xs:string">               <xs:attribute name="version " type="xs:string"/>          </xs:extension>     </xs:complexcontent> </xs:complextype> 

almost there! complextype has complexcontent instead of simplecontent

[1] i'm using master branch of spyne (0f587b2d606b54e41fc5cc3d33b51cc3b324a2ca) , if add __extends__ = primitive.unicode need change line 602 of model/complex.py from:

if eattr._subclasses none 

to

if getattr(eattr, "_subclasses", none) none