根据一个属性值进行 XSD 类型验证
我记得，不久前我有一段类似的 XML：
<item type="Person" name="Pawel" Surname="Wu" />
<item type="Address" city="Sample town" address="Sample street etc." />
并且我想用 XSD 来验证它。然而，上次我这样做时（大约两年前我有这样一个任务）不可能根据属性值指定元素类型（在本例中是type）。所以我被迫将 XML 结构重新设计成这样：
<person name=..... />
<address city=..... />
编写 XSD 是小菜一碟。
今天，我有类似的问题。作为输入，我获得带有通用 item 元素的 XML 文档，这些元素具有 type 属性，而后者，根据此属性值，是否允许/需要其他属性。该形状的文档仍然是在系统中手动创建的，因此我希望有一个可以减少/消除错误的 XSD 文档（很容易忘记带有 type="personalDetails" 的元素 item 必须具有特定的属性集合）。
现在是否可以编写 XSD 模式来验证此类文档？
谢谢，帕维尔
As I remember, some time ago I had similar piece of XML:
<item type="Person" name="Pawel" Surname="Wu" />
<item type="Address" city="Sample town" address="Sample street etc." />
and I wantetd to validate it with XSD. However, last time I did it (about 2 years ago I had such a task) it was impossible to specify element type according to attribute value (type in this example). So I was forced to redesign XML structure into something like this:
<person name=..... />
<address city=..... />
and writing XSD was piece of cake.
Today, I have similar issue. As an input I get XML document with generic item elements that have type attriibute, and latter, depending on this attribute value, another attributes are allowed/required or not. Documents in that shape are still created in system manually, so I would like to have an XSD document that will reduce/eliminate errors (it's easy to forget that element item with type="personalDetails" must have a particular collection of attributes set).
Is it possible to write a XSD schema to validate such a documents now?
Thanks,Pawel
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您无法根据属性值进行验证。但是，您可以使用
xsi:type指定 XML 实例中元素的类型。 点击，点击。You can't validate based on the attributevalue. However, you can use
xsi:typeto specify the type of the element in the XML instance. Click, click.您可以使用 XSD 1.1 来完成此操作，目前已在 Xerces 和 Saxon 中实现（即尚未广泛实现）。
处理此类通用词汇表验证的一种方法是在验证之前对其进行转换，即。将23
You can do this with XSD 1.1, currently implemented in Xerces and Saxon (i.e. not yet very widely).
One way to handle validation of a generic vocabulary like this is to transform it prior to validation, ie. convert
<attribute name="size" value="23">to<size>23</size>