By 

The transportation method of a child segment can also be use,
but this is much easier and shorter. It corresponds to the by Foot, by Car ...
qualification

Attribute Information

Used By

Complex Type TransportationMeanType

Source 

<xs:attribute name="By" type="TransportationCategoryCodeType" use="optional">
  <xs:annotation>
    <xs:documentation>The transportation method of a child segment can also be use, but this is much easier and shorter. It corresponds to the by Foot, by Car ... qualification</xs:documentation>
  </xs:annotation>
</xs:attribute>

Sample