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See for syntax specification.
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for nice clean output we sort the objects of triples,
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in py3 not all things are comparable.
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z TurtleSerializer.predicateListc C s | j |t| d S )N)r rv )r rz r r r r r s zTurtleSerializer.verbc C s t |}|dkrd S |dkr dp"d}| j|7 _| j|d t x8|dd D ](}| jd| jd | j|tdd qPW | j|8 _d S )Nr r z,
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