A scientist want to implement tags (using XML) of following format to create web page which helps in representing Chemistry periodic table for various elements:

<Element atomic number = >
<Name> Sodium</Name>
<Characteristics> Solid, Low melting point….. </Characteristics>
<Atomic Weight> </Atomic Weight>
</Element>

Write document type definition for the above-mentioned tags using XML.

sounds like a school assignment to me.

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