xs:redefinable 

This group is for the
elements which can self-redefine (see <redefine> below).

Element Group Information

Model

xs:simpleType | xs:complexType | xs:group | xs:attributeGroup
Children: xs:attributeGroup, xs:complexType, xs:group, xs:simpleType

Used By

Element xs:redefine
Element Group xs:schemaTop

Source 

<xs:group name="redefinable">
  <xs:annotation>
    <xs:documentation>This group is for the elements which can self-redefine (see <redefine> below).</xs:documentation>
  </xs:annotation>
  <xs:choice>
    <xs:element ref="xs:simpleType"/>
    <xs:element ref="xs:complexType"/>
    <xs:element ref="xs:group"/>
    <xs:element ref="xs:attributeGroup"/>
  </xs:choice>
</xs:group>