def set_property(node_uri, property_name, property_value, ossos_base=True):
    """
    Sets the value of a property on a node in VOSpace.  If the property
    already has a value then it is first cleared and then set.

    @param node_uri:
    @param property_name:
    @param property_value:
    @param ossos_base:
    @return:
    """
    node = client.get_node(node_uri)
    property_uri = tag_uri(property_name) if ossos_base else property_name

    # If there is an existing value, clear it first
    if property_uri in node.props:
        node.props[property_uri] = None
        client.add_props(node)

    node.props[property_uri] = property_value
    client.add_props(node)
Sets the value of a property on a node in VOSpace.  If the property
    already has a value then it is first cleared and then set.

    @param node_uri:
    @param property_name:
    @param property_value:
    @param ossos_base:
    @return: