1<?xml version="1.0"?>
2<!DOCTYPE reln SYSTEM "mathml.dtd" [
3 <!ENTITY infty "infinity">
4]>
5<reln> <eq/>
6        <set>
7          <bvar>  <ci>x</ci>  </bvar>
8          <condition>
9            <reln> <geq/><ci>x</ci><cn>0</cn>   </reln>
10          </condition>
11        </set>
12
13        <interval closure='closed-open'>
14          <cn>0</cn>
15          <ci>&infty;</ci>
16        </interval>
17      </reln>
18