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<div style="margin-bottom: 0cm">Hi Alex and ndn-sim users,</div>
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<div style="margin-bottom: 0cm">I want to add a field in the Interest,
however this field may be sometimes empty.</div>
<div style="margin-bottom: 0cm">So, I must use another class that
extends « Interest » class or I just add a new NackType ?</div>
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<div style="margin-bottom: 0cm">Thanks</div>
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