<?xml version="1.0"?>
<!DOCTYPE letter[
<!ELEMENT letter (note+)>
<!ELEMENT note (to,from?,body*,city)>
<!ELEMENT to (#PCDATA)>
<!ELEMENT from (#PCDATA)>
<!ELEMENT body (#PCDATA)>
<!ELEMENT city (Ahmedabad|Dubai)>
<!ELEMENT Ahmedabad (#PCDATA)>
<!ELEMENT Dubai (#PCDATA)>
]>
<letter>
<note>
<to>Vaibhav Bansal</to>
<from>Vishal Thakkar</from>
<body>
Hello Vaibhav!
</body>
<city>
<Ahmedabad>Sent from Ahmedabad</Ahmedabad>
</city>
</note>
<note>
<to>Vaibhav Bansal</to>
<from>Taki M. Rushnaivala</from>
<body>
Hi Vaibhav!
</body>
<city>
<Dubai>Sent from Dubai</Dubai>
</city>
</note>
</letter>
<!--
Occurences -
1. + means 1 or more
2. * means 0 or more
3. ? means 0 or 1
Sequence -
Example - <!ELEMENT book (title,author,price)>
Choices -
Example - <!ELEMENT city (Mumbai|Ahmedabad)
-->
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