src/Schema/Extension/HierarchyExtension.php
public function buildSchema(Builder $builder)
    {
        $builder->add('allow_children', BooleanDescriptor::class, 'This class is allowed to have children');
        $builder->add('children_types', ArrayDescriptor::class, 'Valid children types');
        $builder->add('uris.create_child', UriCollectionDescriptor::class, 'Collection of URLs where children can be created (keys are the child types)');
    }
public function buildSchema(Builder $builder)
    {
        $builder->add('allow_children', BooleanDescriptor::class, 'This class is allowed to have children');
        $builder->add('children_types', ArrayDescriptor::class, 'Valid children types');
        $builder->add('uris.create_child', UriCollectionDescriptor::class, 'Collection of URLs where children can be created (keys are the child types)');
    }
{@inheritdoc}