The via subelement of the rev element contains an empty value.
rev元素的via子元素包含一个空值。
An empty value for user name and a non-empty value for password.
用户名为空，密码不为空。
A non-empty value for user name and an empty value for password.
用户名不为空，密码为空。
If a security label does not have a value for one of the components, then an empty value is assumed.
如果安全标签没有用于某个组件的值，那么设定该值为空值。
You can test for them explicitly or rely on PHP to return a default empty value when you reference them.
您可以显式地对它们进行检测，或在您引用它们时让PHP返回缺省的空值。
However, elements of type string do not appear as mandatory in the form because the schema accepts an empty value as valid input for a string.
但是，由于模式接受空值作为字符串的有效输入，因此，在表单中字符串类型的元素并不显示为必填的。
Now you set the store ID and supplier ID fields so that they do not accept an empty value. Of course, you can add a schema constraint into the XForms model to achieve this.
现在，设置storeID和supplier ID字段以使这两个字段不接受空值。
Actually such differences bring a series of problems, such as, differences of data structure, empty value data, illegal data, and repeated records, etc. when we need to use the primary data in audit.
这种不一致造成审计中需要的原始数据存在很多问题，比如数据结构的不一致、空值数据、非法数值以及存在重复记录等等。
Actually such differences bring a series of problems, such as, differences of data structure, empty value data, illegal data, and repeated records, etc. when we need to use the primary data in audit.
这种不一致造成审计中需要的原始数据存在很多问题，比如数据结构的不一致、空值数据、非法数值以及存在重复记录等等。
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