To create a local type, simply include the type declaration as a child of the <attribute> element:
<attribute name="title">
<simpleType>
<!-- type information -->
</simpleType>
</attribute>
Using a Global Type for Attribute
You can create a global <simpleType> definition.
Within your attribute declarations, you can refer to a global type by name.
This type can be one of the built-in XML Schema datatypes.
Referring to an Existing Global Attribute
<attribute ref="contacts:kind"/>
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