currency.xsd

<?xml version="1.0" encoding="UTF-8"?>
<!-- currency.xsd -->
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:simpleType name="numeric">
        <xsd:union memberTypes="xsd:int xsd:float" />
    </xsd:simpleType>
    <xsd:element name="exchange">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="currencyFrom" type="currency" />
                <xsd:element name="valueFrom">
                    <xsd:simpleType>
                        <xsd:union memberTypes="xsd:int xsd:float" />
                    </xsd:simpleType>
                </xsd:element>
                <xsd:element name="currencyTo" type="currency" />
                <xsd:element name="valueTo" type="numeric" />
                <xsd:element name="currencyFav" type="currencyFav" />
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
    <xsd:simpleType name="currency">
        <xsd:restriction base="xsd:string">
            <xsd:maxLength value="3" />
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:simpleType name="currencyFav">
        <xsd:list itemType="currency" />
    </xsd:simpleType>
</xsd:schema>