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。

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If the constraint is not mandatory, you have the option of disabling it by clearing the checkbox and clicking OK.

如果这个限制不是强制的，您有权通过清除这个复选框和点击OK选择使它失效。

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Not all these fields used in the various methods are mandatory, so your process must reflect which option you select.

并不是所有运用在各种方法中的字段都是强制性的，因此您的过程必须反映您选择的是哪个选项。

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One option that is gathering support in Europe is mandatory shareholder votes on executive compensation packages.

FORBES: Outrageous Executive Compensation: Corporate Boards, Not the Market, Are to Blame

To many, networking has been viewed as a mandatory activity for sales people but perhaps as an extracurricular option for others, or an activity only to be pursued when a person is in between jobs.

FORBES: Networking- Have you made it part of your job?

This year, the F1 teams will have the option of using KERS. Next year, it will probably be mandatory.

ECONOMIST: Tech.view: Boost for Formula One | The