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【XQuery】Learning XQuery

XQuery is About Querying XML

XQuery is a language for finding and extracting elements and attributes from XML documents.

Here is an example of what XQuery could solve:

“Select all CD records with a price less than $10 from the CD collection stored in cd_catalog.xml”

XQuery for XML is like SQL for databases.

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Posted by Wei on 2018-11-12, Last Modified on 2024-05-07

【XPath】Learning XPath

The XML Example Document

We will use the following XML document in the examples below.

<?xml version="1.0" encoding="UTF-8"?>

<bookstore>

<book>
  <title lang="en">Harry Potter</title>
  <price>29.99</price>
</book>

<book>
  <title lang="en">Learning XML</title>
  <price>39.95</price>
</book>

</bookstore>
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Posted by Wei on 2018-11-12, Last Modified on 2024-05-02

【XML】XML DOM

According to the XML DOM, everything in an XML document is a node:

  • The entire document is a document node
  • Every XML element is an element node
  • The text in the XML elements are text nodes
  • Every attribute is an attribute node
  • Comments are comment nodes

The XML DOM Node Tree

The XML DOM views an XML document as a tree-structure. The tree structure is called a node-tree.

All nodes can be accessed through the tree. Their contents can be modified or deleted, and new elements can be created.

The node tree shows the set of nodes, and the connections between them. The tree starts at the root node and branches out to the text nodes at the lowest level of the tree:

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Posted by Wei on 2018-11-12, Last Modified on 2024-05-02

【XML】Learning XML

The Difference Between XML and HTML

XML and HTML were designed with different goals:

  • XML was designed to carry data - with focus on what data is
  • HTML was designed to display data - with focus on how data looks
  • XML tags are not predefined like HTML tags are
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Posted by Wei on 2018-11-12, Last Modified on 2024-05-02

【WordPress】WordPress安全性设置

自动安全扫描

安装安全插件 如 WordFence。安全插件能做的事，除了自动扫描还有很多，可以仔细查看插件配置页面。

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Posted by Wei on 2018-11-12, Last Modified on 2025-04-23

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