SimpleXML maps an XML document's element tree into a PHP object tree, representing sub-elements as properties.

SimpleXML将一个XML文档中的元素树映射为一个PHP对象树，用属性表示子元素。

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According to feather element tree, the base level and base coordinate system are created, then we can choose them when we need them at any time.

根据特征元素树创建了基准面和基准坐标系，使我们很方便的在需要参照基准的时候来选取它。

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You can call this method on individual elements if you are adjusting them in ways that do not yet expose or connect the element to any element tree.

如果要使用尚未公开的方式调整元素或者将元素与任何元素树连接，可以在各元素上调用此方法。

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And, as you can see from the screen above, the CSS code for each element can be discovered through the DOM tree inspector at the bottom of the workspace.

FORBES: Move up http://i.forbesimg.com t Move down