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2.Well-formed and Valid Document.
CODING:
<?xml version="1.0" encoding="UTF-8"?>

 <!DOCTYPE bookdb[
<!ELEMENT bookdb (author)>
<!ELEMENT author (title,fname,lname)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT fname (#PCDATA)>
<!ELEMENT lname (#PCDATA)>
]>

 <!-- Well formed and Valid -->
<bookdb>
<author>
<title>Mr.</title>
<fname>Tony</fname>
<lname>Stark</lname>
  </author>
</bookdb>

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