Attribute Groups - Example

XHTML has several sets of common attributes (see XHTML 1.1).

For example, the core attributes:

<xs:attributeGroup name="Core">
<xs:attribute name="class" type="xs:NMTOKENS"/>
<xs:attribute name="id" type="xs:ID"/>
<xs:attribute name="title" type="xs:string"/>
</xs:attributeGroup>

Some attribute groups are just aggregations:

<xs:attributeGroup name="Common">
<xs:attributeGroup ref="xhtml:Core"/>
<xs:attributeGroup ref="xhtml:Events"/>
<xs:attributeGroup ref="xhtml:I18N"/>
<xs:attributeGroup ref="xhtml:Style"/>
</xs:attributeGroup>