XML is a W3C Recommendation for
building tag-based structured documents/data.
Tags like in HTML/SGML : <myTag>
Structured: XML requires proper nesting and closing
  - <myTag> bla bla <unclosed> bla
    bla </myTag>
 
  - <myTag> bla bla <nesting> bla
    bla </myTag> </nesting>