Chapter 3 Building an XML model
A simple type is a data type definition for elements or attributes with text-only content.
A simple type cannot contain elements or attributes.
A simple type is defined by derivation of an existing simple type (built-in data type or derived simple type).
There are three kinds of derivation for a simple type:
| Type of derivation | Description |
|---|---|
| List | The simple type contains a white space-separated list of values of an inherited simple type |
| Restriction | The simple type has a range of values restricted to a subset of those of an inherited simple type |
| Union | The simple type contains a union of values of two or more inherited simple types |
For more information on simple type derivations, see section Defining derivations.
Once defined in a model, a simple type can be reused in the definition of an attribute, an element or a complex type.
Example of a simple type in a schema:
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