Case 3-2
Judy has begun to apply the basic information that you have given her about schemas, and she would now like your help in mastering the details of how schemas work.
Judy has included the following element definition in her schema:
     <xs:element name="ingredient">
            <xs:complexType>
                  <xs:sequence>
                        <xs:element name="name" type="xs:string" />
                        <xs:element name="amount" type="xs:string" />
                  </xs:sequence>
            </xs:complexType>
     </xs:element>
-Judy would like to indicate that the "substitution" attribute is a required attribute. Which of the following attribute definitions shows how to accomplish this?

Question

Quizplus · Accepted Answer

In order to indicate that an attribute is required in an XML schema, the "use" attribute should be set to "required". Option A correctly uses this attribute to make the "substitution" attribute required. Option B is incorrect because "required" is not a valid value for the "required" attribute. Option C is also incorrect because "mandatory" is not a valid value for the "use" attribute. Option D is incorrect because "status" is not a valid attribute for defining the requiredness of an attribute.

Case 3-2 Judy Has Begun to Apply the Basic Information That You