[英]XML-Schema : maxOccurs , minOccurs
When I run my code it gives me this error 当我运行我的代码时,它给了我这个错误
[ s4s-att-not-allowed: Attribute 'maxOccurs' cannot appear in element 'element'.]
Here is my Schema : 这是我的架构:
<xs:element name="parameters" maxOccurs="1" minOccurs="0">
<xs:complexType>
<xs:all>
<xs:element ref="p ?"/>
</xs:all>
</xs:complexType>
</xs:element>
<xs:element>
may be declared at top-level (below xs:schema
) but it can't have minOccurs
or maxOccurs
since that doesn't make any sense without a context. <xs:element>
可以在顶层声明(在xs:schema
下面)但它不能有minOccurs
或maxOccurs
因为没有上下文就没有任何意义。 If it's root it can only have one element, if it's not, that information refers to the context of the parent element. 如果它是root,它只能有一个元素,如果不是,则该信息引用父元素的上下文。 This is legal:
这是合法的:
<xs:schema ...>
<xs:element name="parameters">...</xs:element>
...
</xs:schema>
but this is not: 但这不是:
<xs:schema ...>
<xs:element name="parameters" maxOccurs="1" minOccurs="0">...</xs:element>
...
</xs:schema>
You can refer to a top level xs:element
within a group such as xs:sequence
. 您可以引用组中的顶级
xs:element
,例如xs:sequence
。 Here you can use these attributes because now you have a context (how many are allowed in this group). 在这里,您可以使用这些属性,因为现在您有一个上下文(此组中允许的上下文数量)。 This is legal:
这是合法的:
<xs:schema ...>
<xs:element name="parent">
<xs:complexType>
<xs:sequence>
<xs:element ref="parameters" maxOccurs="1" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="parameters">
<xs:complexType>
<xs:all>
<xs:element ref="p" minOccurs="0"/>
</xs:all>
</xs:complexType>
</xs:element>
...
</xs:schema>
Here <parent>
is the context where <parameters>
occurs, so you can say how many times it's allowed in there. 这里
<parent>
是<parameters>
发生的上下文,因此您可以说出它在那里允许的次数。 The definition of <parameters>
is global and you use the ref
attribute to refer to it. <parameters>
的定义是全局的,您可以使用ref
属性来引用它。
If you never need to reuse parameters
or if you are never going to have parameters
as root, you don't need it at top-level and can nest it inside your parent
definition. 如果您永远不需要重用
parameters
或者如果您永远不会以root身份获得parameters
,则不需要它在顶层,并且可以将其嵌套在parent
定义中。 In this case you can use the name
attribute with minOccurs
and maxOccurs
. 在这种情况下,您可以将
name
属性与minOccurs
和maxOccurs
。
<xs:schema ...>
<xs:element name="parent">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" maxOccurs="1" minOccurs="0" />
<xs:complexType>
<xs:all>
<xs:element ref="p" minOccurs="0"/>
</xs:all>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
...
</xs:schema>
You can also refer to a top-level type . 您还可以参考顶级类型 。 It's more common to reuse, extend and restrict types, so this is also a valid (and recommended) way to define your element:
重用,扩展和限制类型更常见,因此这也是定义元素的有效(和推荐)方法:
<xs:schema ...>
<xs:element name="parent">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" type="ParameterType" maxOccurs="1" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:complexType name="ParameterType">
<xs:all>
<xs:element ref="p" minOccurs="0"/>
</xs:all>
</xs:complexType>
...
</xs:schema>
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