dx:summary 

Used to explain briefly the use and content of the corresponding element

Element Information

Model

Used By

Complex Types dx:constraintStatementType, dx:elementType, dx:valueType
Element dx:element

Source 

<xs:element name="summary" type="xs:string">
  <xs:annotation>
    <xs:documentation>Used to explain briefly the use and content of the corresponding element</xs:documentation>
  </xs:annotation>
</xs:element>

Sample