Chain::getDefinition

public function getDefinition($elementsSlice = 0)
{
	if (!isset($this->definition[$elementsSlice]))
	{
		$this->definition[$elementsSlice] = join('.',
			$elementsSlice == 0
				? $this->getDefinitionParts()
				: array_slice($this->getDefinitionParts(), 0, $elementsSlice)
		);
	}

	return $this->definition[$elementsSlice];
}