Why @type is not allowed in <occupation>

Dear all,

I am encoding a very detailed prosopography of a person that had many
occupations with the element <occupation>. We would like to distinguish his
“main” occupations from his “secondary” occupations. Here is an example:

<person>


<!— some elements here -->

<occupation from="1785">Historiker</occupation>
               <occupation>Jurist</occupation>
               <occupation>Statistiker</occupation>

               <occupation>Hofmeister / Söhne des Kanzlers von Gersdorff in
Dresden 1743-46</occupation>
               <occupation >PD philos. / Geschichte, Statistik, Natur- und
Völkerrecht Marburg 1746-</occupation>
               <occupation>aoP. philos. / Geschichte u. Statistik Göttingen
1748-</occupation>
               <occupation>aoP. iur. / Göttingen April 1753-</occupation>


<!— more elements here -->


</person>


For this reason, I had a look at the content model model.personPart
<http://www.tei-c.org/release/doc/tei-p5-doc/en/html/ref-model.personPart.html>.
Most of its elements accepts the attribute @role whereas only <persName>,
<state> and <trait> accept the attribute @type.


Can anyone explain why <occupation> is not permitted to contain a @type
attribute? Or is there a better solution for my problem?


Thanks in advance.


Best,


-- 
​Dr. Antonio Rojas Castro
Researcher, Cologne Center for eHumanities
Communication coordinator, EADH
<http://www.antoniorojascastro.com>