Dealing with CAS with fields under userAttributes array

[craff]

I am working on the ENTs ONE and NEO for education provided by Edifice. Most of the CAS interface have the user fields inside a userAttributes array and do not work with casattras. For instance:

<cas:serviceResponse` xmlns:cas="http://www.yale.edu/tp/cas">
  <cas:authenticationSuccess>
      <cas:user>isabelle.polonio</cas:user>
      <cas:attributes>
           <cas:userAttributes>
                <firstName xmlns="">ISABELLE</firstName>
                <lastName xmlns="">POLONIO</lastName>
                <administrativeStructures xmlns="">96d4d883-d58b-405c-89c7-c91a84e55952</administrativeStructures>
                <emailAcademy xmlns="">isabelle.polonio@http://web-education.net </emailAcademy>
                <structures xmlns="">ENT2DVA-5347</structures>
                <profiles xmlns="">[National_3]</profiles>
                <externalId xmlns="">5554823602</externalId>
                <id xmlns="">91c22b66-ba1b-4fde-a3fe-95219cc18d4a</id>
                <type xmlns="">Teacher</type>
                <structureNode xmlns="">{"optionEnabled":["EDUMEDIA"],"hasApp":true,"created":"2019-07-01T08:17:51.877+02:00","oldName":"Edumedia","name":"Edumedia","checksum":"043671d1462c16e486345717228be20897c26731","externalId":"ae685252-9100-49cf-8065-96baa27fe2b1","modified":"2020-10-27T09:44:30.278+01:00","manualName":false,"id":"bb703ef0-7ba7-42ae-be17-920d5b45ac9a","UAI":"0959998B"}</structureNode>
                <email xmlns="">isabelle.polonio@http://yopmail.com </email>
           </cas:userAttributes>
      </cas:attributes>
</cas:authenticationSuccess>
</cas:serviceResponse>

Moreover, I want to use the "id" user attribute as username on moodle so I would need a possibility to choose a which attribute I want to use as moodle user name.

[mackensen]

@craff I can't recall seeing CAS attributes in that format; what specification are they using?