code: public TypeMapping[] getPropertyTypes(InternalQName propName)
     {
        synchronized (typeMapping)
        {
           TypeMapping[] types = typeMapping.get(propName);
           if (types != null)
           {
              return types;
           }
           else
           {
              return EMPTY;
           }
        }
     }
docs: Returns an array of type mappings for a given property name
  <code>propName</code>. If <code>propName</code> is not defined as a property
  in any registered node type an empty array is returned.
  @param propName the name of the property.
  @return an array of <code>TypeMapping</code> instances.