WD_CONTEXT&CHILD_NODE

Hi all,

In view, we can see WD_CONTEXT which is TYPE REF TO IF_WD_CONTEXT_NODE.

In IF_WD_CONTEXT_NODE-GET_CHILD_NODE, we can see parameter CHILD_NODE is also TYPE REF TO IF_WD_CONTEXT_NODE.

I tried to use WD_CONTEXT directly when I want to get the value of the element like WD_CONTEXT->GET_CHILD_NODE(but this is wrong).

Could anyone tell me what exactly is WD_CONTEXT&CHILD_NODE?