kernel/private/classes/ezptopologicalsortnode.php
public function registerChild( ezpTopologicalSortNode $childNode )
    {
        if (! $this->children->contains( $childNode ) )
            $this->children->attach( $childNode );
    }
public function registerChild( ezpTopologicalSortNode $childNode )
    {
        if (! $this->children->contains( $childNode ) )
            $this->children->attach( $childNode );
    }
public function registerChild ( ezpTopologicalSortNode $ childNode ) { if ( ! $ this -> children -> contains ( $ childNode ) ) $ this -> children -> attach ( $ childNode ) ; }
Register a child node.

@param ezpTopologicalSortNode $childNode Child node to register
Register a child node .