Table of contents

Appendices

1.5 Constraints and Contributions

This specification provides three different kinds of normative statements about schema components, their representations in XML and their contribution to the schema-validation of information items:

Constraint on Schemas

Constraints on the schema components themselves, i.e. conditions components must satisfy to be components at all. Largely to be found in [Datatype components].

Schema Representation Constraint

Constraints on the representation of schema components in XML. Some but not all of these are expressed in [Schema for Datatype Definitions (normative)] and [DTD for Datatype Definitions (non-normative)].

Validation Rule

Constraints expressed by schema components which information items must satisfy to be schema-valid. Largely to be found in [Datatype components].