function verifyUsage(parent,child)
{
-
-
+ // find all the methods that child can be added to parent.
+ var methods = methods[parent].can_contain_using;
+ for(var i =0;i<methods.length;i++) {
+ var m = methods[i].split(':');
+ if (!is_a(child,m[0])) {
+ continue;
+
+ }
+ if (verifyUsageMethod(parent,child,m[1])) {
+ return true;
+ }
+ }
+ return false;
}