Content object of ilPageObject (see ILIAS DTD). 
 
insertContent(ilPageContent $a_cont_obj, string $a_pos, int $a_mode=IL_INSERT_AFTER, string $a_pcid="", bool $remove_placeholder=true)
insert a content node before/after a sibling or as first child of a parent 
 
Class ilPageObject Handles PageObjects of ILIAS Learning Modules (see ILIAS DTD) 
 
createPageContentNode(bool $a_set_this_node=true)
Create page content node (always use this method first when adding a new element) ...