src/etc/testcases/core/include/including_file_parse_error/build.xml

<?xml version="1.0"?>
<!DOCTYPE project [
    <!ENTITY included_file SYSTEM "file:./included_file.xml">
]>

<project name="test" default="test" basedir=".">

  <target name="setup">
  </target>

  &included_file;

  extraneous_text

  <target name="test" depends="included-target">
    <echo>test target ran.</echo>
  </target>

</project>