It is not uncommon for policies and procedures to reference other documents. Even in Australia and the ARC policy. If you actually read their own policy, there are rules that is listed in the specific policy for the ARC Investigation into Institutional Child Abuse, but it references the laws that setup ARC from the early 1900 and other laws. It was not necessary to restate those laws in whole or in part in the current document, if you have a desire to read those references then you can read them.
Also at least in the US schools are different then churches, in the way that schools have a fiduciary responsibility, a special relationship and a duty to protect because they have taken responsibility and taken control of children. Also the idea is that children are obligated by law to attend school, but is not obligated to attend church.