2.2.4.2.2 ActiveDirectoryPrincipal/SID
The SID element specifies the object security identifier (SID) on the principal specified by the ActiveDirectoryPrincipal or ActiveDirectoryGroup directory object. The SID is encoded in base64Binary format ([XMLSCHEMA2] section 3.2.16).
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<xs:element name="SID" nillable="true" type="xs:base64Binary" />