@property
    def next_id(self):
        id_str_lst = self._element.xpath('//@id')
        used_ids = [int(id_str) for id_str in id_str_lst if id_str.isdigit()]
        for n in range(1, len(used_ids)+2):
            if n not in used_ids:
                return n
Returns date format for given column.
dataset/ETHPy150Open python-openxml/python-docx/docx/parts/document.py/DocumentPart.next_id--crossover with--dataset/ETHPy150Open kvesteri/wtforms-alchemy/wtforms_alchemy/generator.py/FormGenerator.date_format