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XML Structures, content, the creators of XML vocabularies, start-tag, end…

- - - - a method to avoid element name conflicts
        
        Namespace
        
        a name with an optional prefix identifying the set of names to which it belongs
        
        <my:line>This is one of my lines</my:line>
        
        <yr:line>This is one of your lines</yr:line>
- - - - root element
    - - each element is completely contained by the root element, or by an element that is so
        contained