XSD SchemaLesson 96Free preview

XSD Substitution

This lesson is part of XML · All levels

Summary

Substitution group allows an element to replace another element in a data document, provided that the substitution element refers to the head element via the substitutionGroup attribute. Head can be marked abstract="true" so that it cannot be used directly, so the data must select one of its members. Another alternative uses the xsi:type attribute to replace the type of an element, rather than its name.

Key points

SubstitutionGroup="nameHead" assigns the element as a substitute member
The head element must be a global element declared in <xs:schema>
Abstract="true" prohibits the use of head directly in data documents
Members must wear a type compatible with the head type.
Xsi:type replaces the type of element, not substitutionGroup replaces the element

Full lesson

Code examples and quizzes

Full lessons, code examples, and quizzes are available to subscribers. 5 questions.