TIP: You can make a string field mandatory by either enabling the mandatory option in the XFDL format option or setting required to true in an XForms bind.

提示：可以通过启用xfdl格式选项中的必填选项或在XForms绑定中将必要选项设置为true来使字符串字段成为必填字段。

youdao

TIP: You can make a string field mandatory by either enabling the mandatory option in the XFDL format option or setting required to true in an XForms bind.

提示：可以通过启用xfdl格式选项中的必填选项或在XForms绑定中将必要选项设置为true来使字符串字段成为必填字段。

youdao