XML Schema How to Restrict Attribute by Enumeration

Question

I have the following XML Tag   lt price currency  euros  gt 20000 00 lt  price gt    How do I restrict the currency attribute to one the following    euros pounds dollars   AND the price to a double   I just get an error when I try to a type on both  here s what I ve got so far    lt xs element name  price  gt       lt xs complexType gt           lt xs attribute name  currency  gt               lt xs simpleType gt                   lt xs restriction base  xs string  gt                       lt xs enumeration value  pounds    gt                       lt xs enumeration value  euros    gt                       lt xs enumeration value  dollars    gt                   lt  xs restriction gt               lt  xs simpleType gt           lt  xs attribute gt       lt  xs complexType gt   lt  xs element gt

User · Answer

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>

User · Answer

lt xs element name  price  type  decimal  gt   lt xs attribute name  currency  type  xs string  value   euros pounds dollars     gt    lt  element gt     This would eliminate the need for enumeration completely  You could change type to double if required

User · Answer

The numerical value seems to be missing from your price definition  Try the following    lt xs simpleType name  curr  gt     lt xs restriction base  xs string  gt       lt xs enumeration value  pounds    gt       lt xs enumeration value  euros    gt       lt xs enumeration value  dollars    gt     lt  xs restriction gt   lt  xs simpleType gt      lt xs element name  price  gt           lt xs complexType gt               lt xs extension base  xs decimal  gt                 lt xs attribute name  currency  type  curr   gt               lt  xs extension gt           lt  xs complexType gt   lt  xs element gt

User · Answer

New answer to old question  None of the existing answers to this old question address the real problem   The real problem was that xs complexType cannot directly have a xs extension as a child in XSD   The fix is to use xs simpleContent first   Details follow       Your XML    lt price currency  euros  gt 20000 00 lt  price gt    will be valid against either of the following corrected XSDs   Locally defined attribute type   lt  xml version  1 0  encoding  UTF-8   gt   lt xs schema xmlns xs  http   www w3 org 2001 XMLSchema  gt      lt xs element name  price  gt       lt xs complexType gt         lt xs simpleContent gt           lt xs extension base  xs decimal  gt             lt xs attribute name  currency  gt               lt xs simpleType gt                 lt xs restriction base  xs string  gt                   lt xs enumeration value  pounds    gt                   lt xs enumeration value  euros    gt                   lt xs enumeration value  dollars    gt                 lt  xs restriction gt               lt  xs simpleType gt             lt  xs attribute gt           lt  xs extension gt         lt  xs simpleContent gt       lt  xs complexType gt     lt  xs element gt   lt  xs schema gt    Globally defined attribute type   lt  xml version  1 0  encoding  UTF-8   gt   lt xs schema xmlns xs  http   www w3 org 2001 XMLSchema  gt      lt xs simpleType name  currencyType  gt       lt xs restriction base  xs string  gt         lt xs enumeration value  pounds    gt         lt xs enumeration value  euros    gt         lt xs enumeration value  dollars    gt       lt  xs restriction gt     lt  xs simpleType gt      lt xs element name  price  gt       lt xs complexType gt         lt xs simpleContent gt           lt xs extension base  xs decimal  gt             lt xs attribute name  currency  type  currencyType   gt           lt  xs extension gt         lt  xs simpleContent gt       lt  xs complexType gt     lt  xs element gt   lt  xs schema gt    Notes   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   lt  xml version  1 0  encoding  UTF-8   gt   lt xs schema xmlns xs  http   www w3 org 2001 XMLSchema  gt      lt xs simpleType name  priceType  gt         lt xs restriction base  xs decimal  gt           lt xs minInclusive value  0 00   gt           lt xs maxInclusive value  99999 99   gt         lt  xs restriction gt       lt  xs simpleType gt      lt xs element name  price  gt       lt xs complexType gt         lt xs simpleContent gt           lt xs extension base  priceType  gt             lt xs attribute name  currency  gt               lt xs simpleType gt                 lt xs restriction base  xs string  gt                   lt xs enumeration value  pounds    gt                   lt xs enumeration value  euros    gt                   lt xs enumeration value  dollars    gt                 lt  xs restriction gt               lt  xs simpleType gt             lt  xs attribute gt           lt  xs extension gt         lt  xs simpleContent gt       lt  xs complexType gt     lt  xs element gt   lt  xs schema gt

[xml] XML Schema How to Restrict Attribute by Enumeration

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