The first step when it comes to XPath is to get a handle on how to reference elements.

对于XPath来说第一步是找到一个引用元素的句柄。

youdao

Each schema definition deals with a single namespace, and although it can reference and use elements defined in another namespace, it cannot define a substructure for those elements.

每一个模式定义都对应一个名称空间，虽然它可以引用和使用其他名称空间中定义的元素，但是它不能为这些元素定义子结构。

youdao

These elements are used to reference the XML schema elements that define the message structures, which are created in the next section.

这些元素用于引用定义消息结构的XML模式元素，下一部分将创建那些消息结构。

youdao

In a statement, the Turkish military said it would act with "utmost sensitivity in order to avoid negative impact on local elements" -- a reference to keeping civilians out of the conflict.

CNN: Turkey launches major Iraq incursion