Here the ids are sequence for both the elements. I want to start the new id for 'a' element again from sec1.

output i got:
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<xml>
  <p id="fig1">here the paragraph comes</p>
  <p id="fig2">here the paragraph comes</p>
  <p id="fig3">here the paragraph comes</p>
  <p id="fig4">here the paragraph comes</p>
  <a id="sec5">here the paragraph comes</a> #note here id is not restarting
  <a id="sec6">here the paragraph comes</a>
  <a id="sec7">here the paragraph comes</a>
  <a id="sec8">here the paragraph comes</a>
  <a id="sec9">here the paragraph comes</a>
  <a id="sec10">here the paragraph comes</a>
  <a id="sec11">here the paragraph comes</a>
  <a id="sec12">here the paragraph comes</a>
  <a id="sec13">here the paragraph comes</a>
  <a id="sec14">here the paragraph comes</a>
  <a id="sec15">here the paragraph comes</a>
  <a id="sec16">here the paragraph comes</a>
</xml>