public function get($name)
    {
        return isset($this->collection[$name]) ? $this->collection[$name] : null;
    }
public function get($name)
    {
        return isset($this->collection[$name]) ? $this->collection[$name] : null;
    }
public function get ( $ name ) { return isset ( $ this -> collection [ $ name ] ) ? $ this -> collection [ $ name ] : null ; }
Retrieve the property definition by name.

@param   string $name

@return  PropertyDefnitionInterface
Retrieve the property definition by name .