Specify different Use attribute of SimpleType when inherited?

[gss]

First, I am evaluating OxygenXML and so far have found it to be a very good, capable xml and xml schema development tool. Thank you!

That said, I am also relatively new to xml schemas, their syntax and capabilities for describing a particular xml syntax. So, given this example schema code:

Code: Select all

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">

    <xs:complexType name="BaseElementType">

        <xs:attribute name="Attr1" type="xs:string" use="required"/>

        <xs:attribute name="Attr2" type="xs:unsignedByte" use="optional"/>

        <xs:attribute name="Attr3" type="xs:unsignedShort" use="optional"/>

    </xs:complexType>

    <xs:element name="Element1" type="BaseElementType">

        <xs:annotation>

            <xs:documentation>

                This element uses the base element attributes as specified, where Attr1

                is a required attribute, but Attr2 and Attr3 are optional.

            </xs:documentation>

        </xs:annotation>

    </xs:element>

    <xs:element name="Element2" type="BaseElementType">

        <xs:annotation>

            <xs:documentation>

                This element uses the base element attributes but for this element I

                want Attr2 to be a required attribute.

            </xs:documentation>

        </xs:annotation>

    </xs:element>

</xs:schema>

I am wondering how to achieve what I asked for in the annotation for Element2 in the code?

Thanks in advance for any help with this!

[george]

One possibility is to define a new type that restricts the base type making that attribute required and then use that for the second element:

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<?xml version="1.0" encoding="UTF-8"?>

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">

    <xs:complexType name="BaseElementType">

        <xs:attribute name="Attr1" type="xs:string" use="required"/>

        <xs:attribute name="Attr2" type="xs:unsignedByte" use="optional"/>

        <xs:attribute name="Attr3" type="xs:unsignedShort" use="optional"/>

    </xs:complexType>

    <xs:element name="Element1" type="BaseElementType">

        <xs:annotation>

            <xs:documentation>

                This element uses the base element attributes as specified, where Attr1

                is a required attribute, but Attr2 and Attr3 are optional.

            </xs:documentation>

        </xs:annotation>

    </xs:element>

    <xs:complexType name="BaseElementType2">

        <xs:complexContent>

            <xs:restriction base="BaseElementType">

                <xs:attribute name="Attr2" type="xs:unsignedByte" use="required"/>

            </xs:restriction>

        </xs:complexContent>

    </xs:complexType>

    <xs:element name="Element2" type="BaseElementType2">

        <xs:annotation>

            <xs:documentation>

                This element uses the base element attributes but for this element I

                want Attr2 to be a required attribute.

            </xs:documentation>

        </xs:annotation>

    </xs:element>

</xs:schema>

Best Regards,
George

[gss]

George, thanks for the very quick response. What you suggested works well. Thank you!

I may ask additional questions in other areas as I hit road blocks, so I hope your tolerance for a beginning schema developer is set high!