public Collection<APIConnectionGroup> getChildConnectionGroups() {
        return childConnectionGroups;
    }
Returns a collection of all child connection groups, or null if children
have not been queried.

@return
    A collection of all child connection groups, or null if children
    have not been queried.
guacamole/src/main/java/org/apache/guacamole/rest/connectiongroup/APIConnectionGroup.java