Only add 'content' member when we simpleContent is a built-in type
Only add 'content' member when we simpleContent is a built-in type

Without this use-made simple types like xs:restrictions would result in two
or more 'content' member variables being generated

Tjoppen/pyjames,Tjoppen/james,Tjoppen/pyjames,Tjoppen/pyjames,Tjoppen/james,Tjoppen/james