Restriction and Extension Type Properties in XML Schemas

When you define a simpleType, you always derive it from a built-in XML Schema simpleType, or a simpleType you previously defined. To specify the simpleType that your simpleType is based on, add a restriction node or an extension node to your simpleType node.

A restriction node indicates that your simpleType is a subset of some other simpleType. An extension node indicates that your simpleType extends the range of values provided by an existing simpleType.

Restriction type nodes and extension type nodes have the properties described in Table 48:

Table 48. Restriction and Extension Type Properties
Property	Description
`Type`	The type is always `Restriction` or `Extension`.
`Base Type`	Indicates the data type that this simpleType is based on.

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