Minor Description
The enforcement should be covered by tests which try to
- create a node with missing mandatory child node
- delete a mandatory child node (already covered in https://svn.apache.org/viewvc/jackrabbit/trunk/jackrabbit-jcr-tests/src/main/java/org/apache/jackrabbit/test/api/NodeTest.java?revision=1776914&view=markup#l514)
- create a node with mandatory child node (already covered in https://svn.apache.org/viewvc/jackrabbit/trunk/jackrabbit-jcr-tests/src/main/java/org/apache/jackrabbit/test/api/NodeTest.java?revision=1776914&view=markup#l514);
