The lander set down on the moon by Buzz Aldrin and Neil Armstrong in 1969 is at the center of this image, a small white dot [arrow] with a long shadow stretching to the right.
Because this information is a few nodes down in the tree, dot notation is used to indicate the exact hierarchical position of the required nodes to the query parser.
因为此信息是树下的几个节点,所以点符号用于说明针对查询解析器的所需节点的确切层次位置。
3
The method offers five types: horizontal, vertical, a stroke down to the left, a bent stroke and a dot or stroke down to the right.