The hasChildrenInRelation operation checks whether a given relation type has any children.
In some cases, objects are most easily located through their relationships with other objects. You can obtain all the objects that relate to another object by a given relation by calling the findRelation operation on that object. The findRelation operation finds only the relatives of a known object. The hasChildrenInRelation operation checks for the presence of objects that present a given relation property. hasChildrenInRelation checks for the presence of objects that are children of other objects and are related to their parents by a given relation type. For example, a snapshot of a virtual machine is a child of the original virtual machine. Checking for all virtual machines that are children of other virtual machines enables you to identify all snapshots.
Knowing how a child is related to its parent is useful if you develop tree viewers to view the objects in the library. The hasChildrenInRelation operation is declared as follows.
public int hasChildrenInRelation(String parentType, String parentId, String relation, String username, String password);