code: @Nullable
    @OverrideOnDemand
    protected GoMappingItem getResolvedGoMappingItem (@Nonnull final String sKey)
    {
      return PhotonCoreManager.getGoMappingMgr ().getItemOfKey (sKey);
    }
docs: Resolve the passed go-mapping key to an {@link GoMappingItem}.
  
  @param sKey
  The key to be resolved. Never <code>null</code> but may be empty.
  @return <code>null</code> if no such go-mapping item exists.