You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <alltransclusions atcontinue="BOPP胶带|317140" />
  </query-continue>
  <query>
    <alltransclusions>
      <t ns="10" title="Template:B-甲基戎=酸单甲脂间硝基苯甲醛净水剂" />
      <t ns="10" title="Template:B.P.C柏木油" />
      <t ns="10" title="Template:B2501067" />
      <t ns="10" title="Template:B4乳剂" />
      <t ns="10" title="Template:BC-01苯丙乳液" />
      <t ns="10" title="Template:BC乳液" />
      <t ns="10" title="Template:BG天夫膏" />
      <t ns="10" title="Template:BJ130盆齿潍坊柴油机齿轮" />
      <t ns="10" title="Template:BJ杀虫剂" />
      <t ns="10" title="Template:BOPP电容膜低压并联电力电容器" />
    </alltransclusions>
  </query>
</api>