Pimcore\Model\Object\Fieldcollection\Definition::extractDataDefinitions PHP Method

    public function extractDataDefinitions($def)
    {
        if ($def instanceof Object\ClassDefinition\Layout) {
            if ($def->hasChilds()) {
                foreach ($def->getChilds() as $child) {
                    $this->extractDataDefinitions($child);
                }
            }
        }
        if ($def instanceof Object\ClassDefinition\Data) {
            $this->addFieldDefinition($def->getName(), $def);
        }
    }