Question

XML element

Answer 1

Do you mean you want a definition, an example, or how to create/validate one? Here’s a short summary plus examples — tell me which part you want expanded.

Quick definition
- An XML element is a marked-up data unit consisting of a start tag, optional content (which can be text and/or other elements), and an end tag. Elements can also be empty (self-closing) and may carry attributes.

Basic structure and rules
- Start tag: <name>
- End tag: </name>
- Empty (self-closing) element: <name/> or <name attr="value"/>
- Elements can contain text and child elements (nesting).
- XML is case-sensitive and must be well-formed: one root element, properly nested tags, attributes quoted, no overlapping tags.
- Optional XML prolog: <?xml version="1.0" encoding="UTF-8"?>
- Element names must follow name rules (start with a letter or underscore, avoid starting with "xml", use no spaces; colons are for namespaces).

Common constructs
- Attributes: <person id="123" name="Alice"/>
- Namespaces: <x:book xmlns:x="http://example.com/ns">...</x:book>
- CDATA for literal text: <![CDATA[ some <raw> text ]]>
- Comments: <!-- comment -->

Example
<?xml version="1.0" encoding="UTF-8"?>
<library>
<book id="b1" genre="fiction">
<title>Example Title</title>
<author>Jane Doe</author>
<summary><![CDATA[Contains <special> characters & markup-like text.]]></summary>
</book>
<book id="b2" genre="nonfiction"/>
</library>

Validation
- Well-formedness is checked by any XML parser.
- Validation against a schema (DTD, XSD, or Relax NG) enforces element/attribute names, types and structure.

If you want: an element name guide, examples with namespaces, how to parse or generate elements in a specific language (Python/JavaScript/Java), or how to create a schema — tell me which.