Below three lines is in one file data.xml

<inline-formula id="ieqn-1"><alternatives><mml:math display="inline"><mml:mi>τ</mml:mi></mml:math></alternatives></inline-formula>

<inline-formula id="ieqn-2"><alternatives><mml:math display="inline"><mml:mi>τ</mml:mi></mml:math></alternatives></inline-formula>

<inline-formula id="ieqn-3"><alternatives><mml:math display="inline"><mml:mi>τ</mml:mi></mml:math></alternatives></inline-formula>

Now i need this lines as separate file like below:

ieqn-1.mml

ieqn-2.mml

ieqn-3.mml

perl script needed.

In reply to extract tag form xml file by Murugan

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