Restriction on attribute : attribute « XML Schema « XML

1. XML
2. XML Schema
3. attribute

Restriction on attribute

File: Data.xml

<?xml version="1.0"?>
<Books xmlns="http://www.java2s.com"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.java2s.com Schema.xsd">
        <Book Category="autobiography" InStock="true" Reviewer="R1">
                <Title>title 1</Title>
                <Author>author 1</Author>
                <Date>2008</Date>
                <ISBN>1-11111-111-1</ISBN>
                <Publisher>Publisher 1</Publisher>
        </Book>
        <Book Category = "fiction" InStock = "false" Reviewer = "R2">
                <Title>title 2</Title>
                <Author>author 2</Author>
                <Date>2007</Date>
                <ISBN>0-111-11111-1</ISBN>
                <Publisher>Publisher 2</Publisher>
        </Book>
</Books>


File: Schema.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://www.java2s.com"
            xmlns="http://www.java2s.com" 
            elementFormDefault="qualified">
    <xsd:element name="Books">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="Book" maxOccurs="unbounded">
                    <xsd:complexType>
                        <xsd:sequence>
                            <xsd:element name="Title" type="xsd:string"/>
                            <xsd:element name="Author" type="xsd:string" maxOccurs="unbounded"/>
                            <xsd:element name="Date" type="xsd:string"/>
                            <xsd:element name="ISBN" type="xsd:string"/>
                            <xsd:element name="Publisher" type="xsd:string"/>
                        </xsd:sequence>
                        <xsd:attributeGroup ref="BookAttributes"/>
                    </xsd:complexType>
                </xsd:element>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
    <xsd:attributeGroup name="BookAttributes"> 
        <xsd:attribute name="Category" use="required">
            <xsd:simpleType>
                <xsd:restriction base="xsd:string">
                    <xsd:enumeration value="autobiography"/>
                    <xsd:enumeration value="non-fiction"/>
                    <xsd:enumeration value="fiction"/>
                </xsd:restriction>
            </xsd:simpleType>
        </xsd:attribute> 
        <xsd:attribute name="InStock" type="xsd:boolean" default="false"/>
        <xsd:attribute name="Reviewer" type="xsd:string" default="none"/>
    </xsd:attributeGroup>
</xsd:schema>

 

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