CODEWITHSUNDEEP
xsd
lumichy
lumichy

Reputation: 83

XSD: How to derive a simpletype both to add a attribute to it and to restrict the acceptable value of it

for example To validate the following element:

 <population class="AAA">100</population >

The constraint I want on the text node is that it should be a numeric value, between 1 and 1000.

my idea looks like this but it doen't work

 <xsd:element name="population">
  <xsd:complexType>
    <xsd:simpleContent>
        <xsd:restriction base="xsd:integer">
            <xsd:minInclusive value="0"/>
            <xsd:maxInclusive value="1000"/>        
        </xsd:restriction>
    </xsd:simpleContent>
    <xsd:attribute name="class" type="xsd:string" use="required"/>
</xsd:complexType>

By the way, I do not want to define any more new type. Can anyone help me. thank you

Upvotes: 2

Views: 1045

Answers (2)

Alberto
Alberto

Reputation: 5141

Extending a simple type with attributes

Inspired by Petru Gardea's answer to XSD custom type with attribute and restriction, I have come up with a solution that should work for you. Your element must be a complexType extending the restricted simpleType with an attribute:

<!-- simple type that we want to extend with an attribute -->
<xs:simpleType name="populationType">
    <xs:restriction base="xs:integer">
        <xs:minInclusive value="0"/>
        <xs:maxInclusive value="1000"/>
    </xs:restriction>
</xs:simpleType>

<!-- extending a simple content element with an attribute -->
<xs:element name="population">
    <xs:complexType>
        <xs:simpleContent>
            <!-- populationType is a simple type -->
            <xs:extension base="populationType">
                <xs:attribute name="class" type="xs:string" use="required"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
</xs:element>

Extending multiple types with the same set of attributes

In addition, if you want to extend multiple types with the same set of attributes, you could use the xsd:attributeGroup as suggested in C. M. Sperberg-McQueen's answer to XSD: Adding attributes to strongly-typed “simple” elements:

<!-- several types declare this set of attributes -->
<xs:attributeGroup name="extensible"> 
    <xs:attribute name="att1" type="xs:string" />
    <xs:attribute name="att2" type="xs:string" />
</xs:attributeGroup>

<!-- simple type that we want to extend with attributes -->
<xs:simpleType name="populationType">
    <xs:restriction base="xs:integer">
        <xs:minInclusive value="0"/>
        <xs:maxInclusive value="1000"/>
    </xs:restriction>
</xs:simpleType>

<!-- extending a simple content element with two 'inherited' attributes -->
<xs:element name="population">
    <xs:complexType>
        <xs:simpleContent>
            <!-- populationType is a simple type -->
            <xs:extension base="populationType">
                <xs:attributeGroup ref="extensible"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
</xs:element>

This would validate the following xml element:

<population att1="AAA" att2="BBB">100</population >

Upvotes: 1

Petru Gardea
Petru Gardea

Reputation: 21658

It is not possible without adding a new type; you can't extend and restrict at the same time.

Upvotes: 1

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