Loads resources from the given resource data stream (of the specified MIME
    content type) into the given collection resource.

def load_into_collection_from_stream(collection, stream, content_type):
    """
    Loads resources from the given resource data stream (of the specified MIME
    content type) into the given collection resource.
    """
    rpr = as_representer(collection, content_type)
    with stream:
        data_el = rpr.data_from_stream(stream)
    rpr.resource_from_data(data_el, resource=collection)