XSD Validation for Visual Studio Intellisense

Question

Hi guys I have a simple XML file with this structure

 ... ...
 <Fields>
  <Field name="MainJob.Id" value="t066_id">
    <Description nullable="false" type="System.Int32" />
  </Field>

What I have actually is this XSD file description:

              <xs:element minOccurs="0" maxOccurs="unbounded" name="Fields">
            <xs:complexType>
              <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="unbounded" name="Field">
                  <xs:complexType>
                    <xs:sequence>
                      <xs:element minOccurs="0" maxOccurs="unbounded" name="Description">
                        <xs:complexType>
                          <xs:attribute name="nullable" type="xs:string" use="required" />                              <xs:attribute name="type" type="xs:string" use="required" />
                          <xs:attribute name="minLength" type="xs:string" use="optional" />
                          <xs:attribute name="maxLength" type="xs:string" use="optional" />
                        </xs:complexType>
                      </xs:element>
                    </xs:sequence>
                    <xs:attribute name="name" type="xs:string" />
                    <xs:attribute name="value" type="xs:string" />
                  </xs:complexType>
                </xs:element>
              </xs:sequence>
            </xs:complexType>
          </xs:element>

How I can define two only available values for the attribute nullable, like 'true' and 'false'? If I nest a SimpleType inside the attribute the .XSD file is not valid anymore. thank you

Answer 1

Type should be not xs:string but xs:boolean for your example, or you can use enumeration (example).

Answer 2

You can add a simpleType like so:

 <xs:simpleType name="TrueOrFalse">
    <xs:restriction base="xs:string">
      <xs:enumeration value="false"/>
      <xs:enumeration value="true"/>
    </xs:restriction>
  </xs:simpleType>

and then change your nullable to:

<xs:attribute name="nullable" type="TrueOrFalse" use="required" />

Marc