Import and return model instance.

def import_model(self, source):
        """Import and return model instance."""
        model = super(StrictImporter, self).import_model(source)

        # Translate entries into dict-based entries.
        sbml.convert_model_entries(
            model, convert_id=lambda entry: entry.id,
            translate_compartment=self._translate_compartment,
            translate_compound=self._translate_compound,
            translate_reaction=self._translate_reaction)

        return model