jenkins-job-builder/tests/triggers/fixtures/pollscm002.xml

<?xml version="1.0" encoding="utf-8"?>
<project>
  <triggers class="vector">
    <hudson.triggers.SCMTrigger>
      <spec>*/30 * * * *</spec>
      <ignorePostCommitHooks>true</ignorePostCommitHooks>
    </hudson.triggers.SCMTrigger>
  </triggers>
</project>