This is from w3school quiz: Which statement is true? 1) All XML elements must have a closing tag 2) All XML documents must have a DTD 3) All XML elements must be lower case 4) All the statements are true
Well-formedness Rules indicate that, 1.Every start tag must have a corresponding end tag 2.Element names begin with a letter such as y or A or an underscore _. Thus <HELP>,<Book>,<volume> are all valid names irrespective of case. 3.For validation , I could use a Schema / DTD. To ensure that the document is only well-formed, I need not use either a DTD/ Schema That is why, only (1) is true.