LengthType Simple Type

Defines a length type that is used to specify the number of bytes or characters in a variable length data item such as binary data or an ANSI or Unicode string. The value can be specified as an xs:unsignedShort value or as a string that references the name of data item node that contains the unsigned short value.

<xs:simpleType name="LengthType">
    <xs:union
        memberValues="unsignedShort string"
     />
</xs:simpleType>

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]