Ant xml schema is much more restrictive than jenkins.

Non allowed fields in ant, allowed in jenkins:

testsuites:
- apache ant forbids all attributes.

testsuite:
- apache ant forbids attributes: disabled, skipped
- apache ant allows elements system-out and system-err, that are in testcase for jenkins

testcase:
- apache ant forbids attributes: assertions, status
- apache ant forbids elements: skipped, system-out, system-err


