XML Schema 参考手册 完整 XML Schema 参考手册 The restriction element defines constraints on simpleType, simpleContent, or complexContent definitions. 父元素： SimpleType, simpleContent, complexContent (? The symbol declares that the element can appear zero or once in the restriction element. ) Attribute Description Id Optional. Specifies the unique ID of the element. Base Necessary. Specifies the name of the built-in data type, simpleType, or complexType element defined in the schema (or other schema indicated by the specified namespace). Any attributes Optional. Specifies any other attributes with the non-schema namespace. The following example defines an element named “age” with constraints. The value of age cannot be less than 0 or greater than 100: This example defines an element named “initials”. The “initials” element is a simple type with constraints. Acceptable values are three uppercase or lowercase letters from a to z: This example defines an element named “password”. The “password” element is a simple type with constraints. The value must be at least 5 characters and up to 8 characters: This example shows a complex type definition that uses constraints. The complex type “Chinese_customer” is derived from a normal customer complex type, and the fixed value of its country element is “China”:Definition and usage ¶
Element information ¶
Grammar ¶
<restriction
id=ID
base=QName
*any attributes*
>
Content for simpleType:
(annotation?,(simpleType?,(minExclusive|minInclusive\|
maxExclusive|maxInclusive|totalDigits|fractionDigits\|
length|minLength|maxLength|enumeration|whiteSpace|pattern)*))
Content for simpleContent:
(annotation?,(simpleType?,(minExclusive \|minInclusive\|
maxExclusive|maxInclusive|totalDigits|fractionDigits\|
length|minLength|maxLength|enumeration|whiteSpace|pattern)*)?,
((attribute|attributeGroup)*,anyAttribute?))
Content for complexContent:
(annotation?,(group|all|choice|sequence)?,
((attribute|attributeGroup)*,anyAttribute?))
</restriction>
Example 1 ¶
<xs:element name="age">
<xs:simpleType>
<xs:restriction base="xs:integer">
<xs:minInclusive value="0"/>
<xs:maxInclusive value="100"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
Example 2 ¶
<xs:element name="initials">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value="[a-zA-Z][a-zA-Z][a-zA-Z]"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
Example 3 ¶
<xs:element name="password">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:minLength value="5"/>
<xs:maxLength value="8"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
Example 4 ¶
<xs:complexType name="customer">
<xs:sequence>
<xs:element name="firstname" type="xs:string"/>
<xs:element name="lastname" type="xs:string"/>
<xs:element name="country" type="xs:string"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="Norwegian_customer">
<xs:complexContent>
<xs:restriction base="customer">
<xs:sequence>
<xs:element name="firstname" type="xs:string"/>
<xs:element name="lastname" type="xs:string"/>
<xs:element name="country" type="xs:string" fixed="Norway"/>
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>