XML 스키마 열거로 특성을 제한하는 방법

XML 스키마 열거로 특성을 제한하는 방법

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다음 XML 태그가 있습니다.

<price currency="euros">20000.00</price>

통화 속성을 다음 중 하나로 제한하려면 어떻게합니까?

• 유로
• 파운드
• 불화

그리고 가격은 두 배로?

둘 다 유형을 시도 할 때 오류가 발생합니다. 지금까지 얻은 내용은 다음과 같습니다.

<xs:element name="price">
    <xs:complexType>
        <xs:attribute name="currency" type="xs:string">
            <xs:simpleType>
                <xs:restriction base="xs:string">
                    <xs:enumeration value="pounds" />
                    <xs:enumeration value="euros" />
                    <xs:enumeration value="dollars" />
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
    </xs:complexType>
</xs:element>

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가격 정의에서 숫자 값이 누락 된 것 같습니다. 다음을 시도하십시오.

<xs:simpleType name="curr">
  <xs:restriction base="xs:string">
    <xs:enumeration value="pounds" />
    <xs:enumeration value="euros" />
    <xs:enumeration value="dollars" />
  </xs:restriction>
</xs:simpleType>



<xs:element name="price">
        <xs:complexType>
            <xs:extension base="xs:decimal">
              <xs:attribute name="currency" type="curr"/>
            </xs:extension>
        </xs:complexType>
</xs:element>

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이전 질문에 대한 새로운 답변

이 오래된 질문에 대한 기존 답변 중 실제 문제를 해결하는 것은 없습니다.

진짜 문제 는XSD에서 아이를xs:complexType직접 가질 수 없다는 것xs:extension입니다. 수정은xs:simpleContent먼저사용하는 것입니다. 자세한 내용은 다음과 같습니다.

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XML,

<price currency="euros">20000.00</price>

다음 수정 된 XSD 중 하나 에 대해 유효합니다 .

로컬에서 정의 된 속성 유형

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:element name="price">
    <xs:complexType>
      <xs:simpleContent>
        <xs:extension base="xs:decimal">
          <xs:attribute name="currency">
            <xs:simpleType>
              <xs:restriction base="xs:string">
                <xs:enumeration value="pounds" />
                <xs:enumeration value="euros" />
                <xs:enumeration value="dollars" />
              </xs:restriction>
            </xs:simpleType>
          </xs:attribute>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>
  </xs:element>
</xs:schema>

전역 적으로 정의 된 속성 유형

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:simpleType name="currencyType">
    <xs:restriction base="xs:string">
      <xs:enumeration value="pounds" />
      <xs:enumeration value="euros" />
      <xs:enumeration value="dollars" />
    </xs:restriction>
  </xs:simpleType>

  <xs:element name="price">
    <xs:complexType>
      <xs:simpleContent>
        <xs:extension base="xs:decimal">
          <xs:attribute name="currency" type="currencyType"/>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>
  </xs:element>
</xs:schema>

노트

• As commented by @Paul, these do change the content type of price from xs:string to xs:decimal, but this is not strictly necessary and was not the real problem.
• As answered by @user998692, you could separate out the definition of currency, and you could change to xs:decimal, but this too was not the real problem.

The real problem was that xs:complexType cannot directly have a xs:extension as a child in XSD; xs:simpleContent is needed first.

A related matter (that wasn't asked but may have confused other answers):

How could price be restricted given that it has an attribute?

In this case, a separate, global definition of priceType would be needed; it is not possible to do this with only local type definitions.

How to restrict element content when element has attribute

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:simpleType name="priceType">  
    <xs:restriction base="xs:decimal">  
      <xs:minInclusive value="0.00"/>  
      <xs:maxInclusive value="99999.99"/>  
    </xs:restriction>  
  </xs:simpleType>

  <xs:element name="price">
    <xs:complexType>
      <xs:simpleContent>
        <xs:extension base="priceType">
          <xs:attribute name="currency">
            <xs:simpleType>
              <xs:restriction base="xs:string">
                <xs:enumeration value="pounds" />
                <xs:enumeration value="euros" />
                <xs:enumeration value="dollars" />
              </xs:restriction>
            </xs:simpleType>
          </xs:attribute>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>
  </xs:element>
</xs:schema>

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you need to create a type and make the attribute of that type:

<xs:simpleType name="curr">
  <xs:restriction base="xs:string">
    <xs:enumeration value="pounds" />
    <xs:enumeration value="euros" />
    <xs:enumeration value="dollars" />
  </xs:restriction>
</xs:simpleType>

then:

<xs:complexType>
    <xs:attribute name="currency" type="curr"/>
</xs:complexType>

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<xs:element name="price" type="decimal">
<xs:attribute name="currency" type="xs:string" value="(euros|pounds|dollars)" /> 
</element> 

This would eliminate the need for enumeration completely. You could change type to double if required.

참고URL : https://stackoverflow.com/questions/8925706/xml-schema-how-to-restrict-attribute-by-enumeration