xs:schemaTop 

This group is for the
elements which occur freely at the top level of schemas.
All of their types are based on the "annotated" type by extension.

Element Group Information

Model

xs:simpleType | xs:complexType | xs:group | xs:attributeGroup | xs:element | xs:attribute | xs:notation
Children: xs:attribute, xs:attributeGroup, xs:complexType, xs:element, xs:group, xs:notation, xs:simpleType

Used By

Elements xs:override, xs:schema

Source 

<xs:group name="schemaTop">
  <xs:annotation>
    <xs:documentation>This group is for the elements which occur freely at the top level of schemas. All of their types are based on the "annotated" type by extension.</xs:documentation>
  </xs:annotation>
  <xs:choice>
    <xs:group ref="xs:redefinable"/>
    <xs:element ref="xs:element"/>
    <xs:element ref="xs:attribute"/>
    <xs:element ref="xs:notation"/>
  </xs:choice>
</xs:group>