First, determine the element tag and then get the text node value for the element tag.
您首先要确定元素标签，然后获得元素标签的文本节点值。
Here you have a struct that includes the first element as a data item and the second element as a pointer to the next node.
这样您就拥有了一个struct，其中第一个元素为数据条目，第二个元素为指向下一个节点的指针。
It can also save time, if it turns out (as it often does) that the only thing done with the node-set is to test whether it is empty, or to get the value of its first element.
它还可以节省时间，如果对于节点集的唯一操作就是测试它是否是空的(通常是这种情况)，或者对它的第一个元素进行赋值。
The first query returns the full element node, i.e. 29, while the second query only returns its text node value 29.
第一个查询将返回完整的元素节点，即29，而第二个查询仅返回其文本节点值29。
One thing to consider about the code: in DOM, the first node represents the document as a whole, so, to get the element book to read the namespaces, you have to go to the children exactly one time.
有关此代码，有一点需要注意：在DOM中，第一个节点代表整个文档，所以，要让元素book读取这些名称空间，必须访问子节点刚好一次。
Even though most name elements are the first element within their parent element, they are the second node because a blank text node (including a line break) exists between the tags.
即使大多数name元素是它们父元素中的第一个元素，它们其实是第二个节点，因为标记之间存在一个空文本节点(包含一个换行)。
n.firstpos(): the set of XML nodes that match the first element of an XPath rooted at node n
firstpos() ：与根在节点n 上的XPath的第一个元素匹配的XML节点集
A 4-node axisymmetric solid element is derived by combined hybrid methods in this paper at first.
本文首先利用组合杂交有限元法得出了一个四节点轴对称元。
For example, it checks that the XML declaration is the first node, that one and only one root-level element exists, and so on.
例如，它会检查XML宣告是第一个节点，而且是根层级项目所存在的唯一节点等。
For example, it checks that the XML declaration is the first node, that one and only one root-level element exists, and so on.
例如，它会检查XML宣告是第一个节点，而且是根层级项目所存在的唯一节点等。
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