An XML structure is typically composed of elements and attributes-at the most basic level, elements are containers for data and attributes are labels for the data containers.

一个XML结构通常由元素和属性组成—在最基本的层面上，元素是数据容器，属性是数据容器的标签。

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The sea platform electric power distribution automated system basic structure is: In the structure USES two level control, three networks ways, safe reliable, advanced are easy to expand.

海洋平台电力配电自动化系统的基本框架结构为：结构上采用两级控制，三层网络方式，安全可靠，先进易扩展。

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The paper introduced the technical parameters, basic structure and work cycle of each subsystem of air compressor with the aim to improve the operation level of workers.

文中介绍了空压机的有关技术参数和基本结构、各子系统工作循环，以便提高工作人员对空压机的操作水平。

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Both Delta and US Airways have a three-tier redemption structure, offering seats at the basic level, a midtier level at around 40, 000 miles for a domestic coach ticket and a full-fare level for as many as 60, 000 miles for domestic coach round trips.

WSJ: Frequent-Flier Miles: Best Airlines for Cashing In