Integral snippet for eq 7.2.1 of DLMF, August 2018

integral_example.xml

 <apply>
    <apply>
       <csymbol cd="ambiguous">superscript</csymbol>
       <apply>
          <csymbol cd="ambiguous">subscript</csymbol>
          <int />
          <cn type="integer">0</cn>
       </apply>
       <ci>italic-z</ci>
    </apply>
    <apply>
       <times />
       <apply>
          <csymbol cd="ambiguous">superscript</csymbol>
          <exponentiale />
          <apply>
             <minus />
             <apply>
                <csymbol cd="ambiguous">superscript</csymbol>
                <ci>italic-t</ci>
                <cn type="integer">2</cn>
             </apply>
          </apply>
       </apply>
       <apply>
          <diff />
          <ci>italic-t</ci>
       </apply>
    </apply>
  </apply>

https://dlmf.nist.gov/7.2#E1

Snippet above contains only the integral expression from RHS

Specification:
https://www.w3.org/TR/MathML3/chapter4.html#contm.int

Hence the compliant representation would be:

  <apply>
    <int />
    <bvar><ci>italic-t</ci></bvar>
    <lowlimit><cn type="integer">0</cn></lowlimit>
    <uplimit><ci>italic-z</ci></uplimit>
    <apply>
        ... integrand ...
    </apply>
  </apply>

possibly with the <diff> apply entirely omitted.