Well-Formed & Valid XML

Question 1

What is a Well-Formed XML Document?

Answer 1

1) Single Root Element
2) All Tags Are Matching
3) Tags are properly nested
4) Unique Attributes Within Elements
5) Has No Syntax Errors
6) Confers to W3C Standards

Question 2

What is a Valid XML Document?

Answer 2

1) If the Document XML Is Well-Formed

2) It Confers to the DTD or Schema