xml 有一个空的 xs:date 元素被 XSD 验证 OK
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Having an empty xs:date element being validated OK by the XSD
提问by MoreCoffee
I have this in my XSD:
我的 XSD 中有这个：
<xs:element name="End_Date" type="xs:date" minOccurs="0"/>
I would like the validation pass if there's a date or if there's an empty node
如果有日期或有空节点，我想要验证通过
<End_Date>2011-05-31T00:00:00.000</End_Date>should be ok as well as
<End_Date></End_Date>
<End_Date>2011-05-31T00:00:00.000</End_Date>应该没问题
<End_Date></End_Date>
How can I modifiy the XSD to make it so?
我如何修改 XSD 以使其如此？
I tried different things:
我尝试了不同的事情：
nillable="true"
nillable="true"
and
和
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"
and
和
<xs:element name="End_Date">
<xs:simpleType>
<xs:union memberTypes="xs:date">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value=""/>
</xs:restriction>
</xs:simpleType>
</xs:union>
</xs:simpleType>
</xs:element>
None of them worked.
他们都没有工作。
Error:
错误：
Error detected : The 'xxxxxxxxxx:End_Date' element is invalid - The value '' is invalid according to its datatype 'http://www.w3.org/2001/XMLSchema:date' - The string '' is not a valid XsdDateTime value.
检测到错误：'xxxxxxxxxx:End_Date' 元素无效 - 根据其数据类型 'http://www.w3.org/2001/XMLSchema:date'，值 '' 无效 - 字符串 '' 不是有效的 XsdDateTime价值。
回答by Michael Kay
Perhaps you are confused about the difference between xs:date and xs:dateTime. You have used xs:date in your schema, but your example is an xs:dateTime.
也许您对 xs:date 和 xs:dateTime 之间的区别感到困惑。您在架构中使用了 xs:date，但您的示例是 xs:dateTime。
There are three ways of achieving what you want:
有三种方法可以实现你想要的：
(a) define a type that is a union of (xs:dateTime and (restriction of xs:string allowing only ""))
(a) 定义一个类型，它是 (xs:dateTime 和 (xs:string 的限制只允许 ""))
(b) define a type that is a list of xs:dateTime with minLength = 0, maxLength = 1
(b) 定义一个类型，它是一个 xs:dateTime 列表，其中 minLength = 0, maxLength = 1
(c) define the element to be nillable. In this case the instance will have to say xsi:nil="true", which to my mind makes the facility pretty useless.
(c) 将元素定义为可空。在这种情况下，实例将不得不说 xsi:nil="true"，在我看来，这使得该工具非常无用。
If you try one of these and it doesn't work, tell us exactly what you did and exactly how it failed.
如果您尝试其中一种方法但它不起作用，请准确告诉我们您做了什么以及它是如何失败的。
回答by Arpit Patel
Set Type="xs:date", derivedBy="list" and minOccurs="0"
which looks like this in your XML Schem Document
<xs:element name="EffectiveDt" nillable="true" minOccurs="0">
<xs:simpleType>
<xs:list itemType="xs:date"/>
</xs:simpleType>
</xs:element>
This will surely help you, I tried in my Code Works perfect.
Validate Your XML against XSD here
I am using this online XML validation against XSD tool.
回答by user7499251
This worked for me :
这对我有用：
[in xsd :]
[在 xsd 中：]
<xs:simpleType name="DateOrEmptyDate">
<xs:union memberTypes="xs:date">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value=""/>
</xs:restriction>
</xs:simpleType>
</xs:union>
</xs:simpleType>
[Valid xml :]
[有效的 xml :]
<EndDate/>
<EndDate>2017-12-31</EndDate>
[Invalid xml :]
[无效的 xml :]
<EndDate>2017-31-31</EndDate>
<EndDate>2017-31-31</EndDate>
回答by tom redfern
xsi:nill=true should definitely be valid as long as you define the schema element as nillable. What validator are you using?
只要您将架构元素定义为 nillable，xsi:nill=true 就肯定是有效的。你用的是什么验证器？
Schema:
架构：
<xs:schema xmlns="http://myNS" targetNamespace="http://myNS" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="Root">
<xs:complexType>
<xs:sequence>
<xs:element name="End_Date" nillable="true" type="xs:dateTime" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
Instance:
实例：
<ns0:Root xmlns:ns0="myNS">
<End_Date xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>
</ns0:Root>
is valid.
已验证。
