<xs:element name="attribute">
<xs:complexType>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element ref="ex:aggregate" />
</xs:choice>
<xs:attribute name="select" type="xs:NMTOKEN" use="required" />
<xs:attribute name="name" type="xs:NMTOKEN" use="optional" />
<xs:attribute name="exp-attribute" type="ex:exp-attribute" use="optional" />
<xs:attribute name="content" type="ex:content" use="optional" />
<xs:attribute name="keep" type="xs:boolean" default="false" />
<xs:attribute name="flatten" type="ex:boolean_or_depth" use="optional" />
<xs:attribute name="sparse" type="xs:boolean" use="optional" />
<xs:attribute name="tagless" type="ex:boolean_or_unspecified" use="optional" />
<!-- <xs:attribute name="notation" type="xs:NOTATION" use="optional"/> -->
</xs:complexType>
</xs:element>
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