'Returns a new block structure for given the arguments.'

@classmethod
def create_new(cls, root_block_usage_key, block_relations, transformer_data, block_data_map):

    block_structure = BlockStructureBlockData(root_block_usage_key)
    block_structure._block_relations = block_relations
    block_structure.transformer_data = transformer_data
    block_structure._block_data_map = block_data_map
    return block_structure
