setAllowEmptyValue(bool $boolean) Sets if this node is allowed to have an empty value.

ExprBuilder

interface FileLocatorInterface Methods string|array

NodeDefinition|$this

class BaseNode implements

addChild(NodeInterface $node)

array getChildren() Retrieves the children of this node.

class BooleanNodeDefinition extends

string getName() Returns the name of this node.

mixed normalize(mixed $value) Normalizes the supplied value.