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XML Semantics: a Tree !
<data>
<person id=“o555” >
<name> Mary </name>
<address>
<street> Maple </street>
<no> 345 </no>
<city> Seattle </city>
</address>
</person>
<person>
<name> John </name>
<address> Thailand  </address>
<phone> 23456  </phone>
</person>
</data>
data
Mary
person
person
name
address
name
address
street
no
city
Maple
345
Seattle
John
Thai
phone
23456
id
o555
Element
node
Text
node
Attribute
node
Order matters !!!