public function deleteProperties($properties)
    {
        if (is_array($properties)) {
            foreach($properties as $prop) {
                unset($this->properties[$prop]);
            }
        } else {
            unset($this->properties[$properties]);
        }
        return $this;
    }
public function deleteProperties($properties)
    {
        if (is_array($properties)) {
            foreach($properties as $prop) {
                unset($this->properties[$prop]);
            }
        } else {
            unset($this->properties[$properties]);
        }
        return $this;
    }
public function deleteProperties ( $ properties ) { if ( is_array ( $ properties ) ) { foreach ( $ properties as $ prop ) { unset ( $ this -> properties [ $ prop ] ) ; } } else { unset ( $ this -> properties [ $ properties ] ) ; } return $ this ; }
Delete property metadata.

@param array|string $properties An array of property keys or a property key.
@return Metadata $this
Delete property metadata .