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Value Constraints on Attributes

File: Data.xml <?xml version = "1.0" ?> <CreditAccount currency = "US$">    <AccountName>Ray Bayliss</AccountName>    <AccountNumber>27012</AccountNumber>    <Amount>200.00</Amount> </CreditAccount> File: Schema.xsd <?xml version = "1.0" ?> <schema xmlns= "http://www.w3.org/2001/XMLSchema"> <element name = "CreditAccount">    <complexType>       <sequence>          <element name = "AccountName" type = "string" />          <element name = "AccountNumber" type = "integer" />          <element name = "Amount" type = "string" />       </sequence>       <attribute name = "currency" default = "US$" />    </complexType> </element> </schema>