restriction
XML Schema restriction elementi
❮ To‘liq XML Schema ma’lumotnomasi
Ta’rif va qo‘llanilishi
restriction elementi simpleType, simpleContent yoki complexContent ta’rifi uchun cheklovlarni aniqlaydi.
Element haqida ma’lumot
- Ota elementlar: simpleType, simpleContent, complexContent
Sintaksis
<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>(? belgisi element restriction elementi ichida nol yoki bir marta kelishi mumkinligini bildiradi)
| Atribut | Tavsif |
|---|---|
| id | Ixtiyoriy. Element uchun noyob ID belgilaydi |
| base |
Majburiy. Ushbu yoki boshqa sxemada aniqlangan o‘rnatilgan ma’lumot tipi, simpleType elementi yoki complexType elementining nomini belgilaydi |
| any attributes | Ixtiyoriy. Sxemaga oid bo‘lmagan nomlar fazosidagi boshqa har qanday atributlarni belgilaydi |
1-misol
Bu misol cheklovga ega "age" nomli elementni aniqlaydi. age qiymati 0 dan kichik yoki 100 dan katta bo‘lishi MUMKIN EMAS:
<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>
2-misol
Bu misol ham "initials" nomli elementni aniqlaydi. "initials" elementi cheklovga ega oddiy tipdir. Yagona ruxsat etilgan qiymat — a dan z gacha bo‘lgan KICHIK YOKI KATTA harflardan UCHTASI:
<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>3-misol
Bu misol "password" nomli elementni aniqlaydi. "password" elementi cheklovga ega oddiy tipdir. Qiymat kamida besh va ko‘pi bilan sakkiz belgidan iborat bo‘lishi kerak:
<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>4-misol
Bu misolda restriction yordamida murakkab tip ta’rifi ko‘rsatilgan. "Norwegian_customer" murakkab tipi umumiy customer murakkab tipidan hosil qilingan va uning country elementi "Norway" qiymatiga qat’iy belgilab qo‘yilgan:
<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>❮ To‘liq XML Schema ma’lumotnomasi
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