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Following rules must be applied when working with XML:

• Single, unique root element
• Matching open/close tags
• Consistent capitalisation
• Correctly nested elements (no overlapping elements)
• Attribute values enclosed in quotes
• No repeating attributes in an element

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XML documents must contain a root element. All other elements must be nested within the root element.

All elements can have sub (children) elements. Elements with sub elements are also called Nodes.

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XML stands for eXtensible Markup Language
XML is a markup language like HTML
XML provides a uniform method for describing and exchanging structured data
Describes structure and semantics, not formatting
XML focuses on providing information about the data itself and how it relates to other data