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XML
XML104
3
Read Nested Elements
Nested XML shows parent and child relationships.
What does nesting mean in XML?
Nesting means one XML element contains another XML element inside it.
XML is useful because it can show relationships.
A record can contain smaller pieces of information.
The outside element is often called the parent.
The inside elements are often called children.
Indentation is not the structure itself, but it makes the structure easier to read.
Parent and child elements
<book>
<title>Learning XML</title>
<author>
<first_name>Maya</first_name>
<last_name>Singh</last_name>
</author>
</book>
<book> is the parent for the whole record.
<title> is a child of book.
<author> is also a child of book.
<first_name> is a child of author.
Each element must close before its parent closes.
Relationships
Nesting shows what belongs inside what.
Records
Complex data can be organized into smaller parts.
Reading
Indentation helps people follow levels.
Validation
Clean nesting helps software parse the document.
Broken nesting
<book>
<title>Learning XML
</book>
</title>
Clean nesting
<book>
<title>Learning XML</title>
</book>
Ask ChatGPT: "Is my XML nesting clean, and does each child element close before its parent closes?"
Identify a parent element.
Identify a child element.
Create a book element with nested title and author.
Break the nesting and explain what went wrong.
Fix the nesting so the XML is well formed.
Closing the parent before closing the child.
Thinking indentation fixes broken structure.
Putting unrelated information inside the wrong parent.
Making nesting so deep that the file becomes hard to read.
Forgetting that every level still needs correct closing tags.
Read nested XML as parent and child structure.
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