def set_meta_all(self, props):
delta_props = self.get_meta()<EOL>for key in delta_props.keys():<EOL><INDENT>if key not in props:<EOL><INDENT>delta_props[key] = None<EOL><DEDENT><DEDENT>delta_props.update(props)<EOL>self.set_meta(delta_props)<EOL>
Set metadata values for collection.

        ``props`` a dict with values for properties.