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- Rule 1: All XML Must Have a Root Element
- Rule 2: All Tags Must Be Closed
- Rule 3: All Tags Must Be Properly Nested
- Rule 4: Tag Names Have Strict Limits
- Rule 5: Tag Names Are Case Sensitive
- Rule 6: Tag Names Cannot Contain Spaces
- Rule 7: Attribute Values Must Appear Within Quotes
- Rule 8: White Space Is Preserved
- Rule 9: Avoid HTML Tags (Optional)
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Rule 6: Tag Names Cannot Contain Spaces
Spaces in tag names can cause all sorts of problems with data-intensive applications, so they’re prohibited in XML.