LinuxQuestions.org - XML Schema complexType

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XML Schema complexType

I want to be able to do the following in XML:

Code:

<transaction>

  <amount currency="USD">100.00</amount>

</transaction>

How would I write the XML schema for this? My first attempt at a solution was:

Code:

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">



  <xsd:complexType name="amountType" type="xsd:float">

      <xsd:attribute name="currency" type="xsd:string"/>

  </xsd:complexType>



  <xsd:element name="transaction">

      <xsd:sequence>

        <xsd:element name="amount" type="amountType"/>

      </xsd:sequence>

  </xsd:element>



</xsd:schema>

That's obviously wrong because complexType cannot have a type attribute. How do I specify that <amount> has a currency attribute, and can have a positive floating point value as content?

I'm on the very early stages of XML but it could be done something like this I think. Basically define your own simple type for a currency value.. You can also use xsd:presicion value="10" or whatever to define the total number of digits used including decimal and xsd:scale for the number of decimal places rather than fractionDigits. There is probably a better, convaluted way,as thisvery much a beginner here but all practice is good :)

Code:

<?xml version="1.0"?>



<xsd:schema xlmns="http://www.w3.org/2000/10/XMLSchema">

  

  <xsd:element name="currencyTransaction">

  <xsd:complexType>

    <xsd:sequence>

      <xsd:element name="transaction" type="transactionType" minOccurs="0" maxOccurs="unbounded" / >  

    </xsd:sequence>

  </xsd:complexType>

  </xsd:element>



<xsd:complexType name="transactionType">

 <xsd:sequence>

  <xsd:element name="transactionCurrency" type="xsd:string"/>

 </xsd:sequence>



 <xsd:attribute name="transactionValue" type="currencyValue" use="required"/> 



</xsd:complexType> 



<xsd:simpleType="currencyValue">

 <xsd:restriction base="xsd:decimal">

  <xsd:minInclusive value="0"/>

  <xsd:fractionDigits value="2"/>

 </xsd:restriction>

</xsd:simpleType>



</xsd:schema>