<xs:element name="extends">
<xs:annotation>
<xs:documentation>Abstract rules are named lists of assertions without a context expression. The current rule uses all the assertions from the abstract rule it extends.</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:attribute name="rule" use="required" type="xs:IDREF">
<xs:annotation>
<xs:documentation>The required rule attribute references an abstract rule.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attributeGroup ref="sch:foreign-empty"/>
</xs:complexType>
</xs:element> |