Generating xml from oracle-data

Question

In our company we have to export customer-data to xml using a predefined format (which we cannot change).
This xml will subsequently be used to import the data into another system.
I'm not that familiar with XML. Most of the work can be done using dbms_xmlgen which is pretty simple and straightforward to use
There is one type of element I cannot place correctly in the specification
The use of foreign keys. For instance
A employee has a foreign key to a bussiness unit that should be written down in the xml
when using "normal" dbms_xmlgen the tag would be like
<bussinessunit>"bisut100"</bussinessunit>
But the specification specifies the following format
<bussinessunit bussinesunitId="bisut100"/>
Any idea how to get this using dbms_xmlgen?
Or if not possible with dbms_xmlgen how could this easily be achieved?

Answer 1

Thanks for the reply and the challenge is more to generate the closing tag exactly like in the specification
The following is a snippet of what is required
-<employee>
<id>2</id>
<empno>102105<empno>
-<name>
<firstname>Tom</firstname>
<lastname>Hanks</lastname>
</name>
<bussinessunit bussinesunitId="bisut100"/>
<employee>
-<employee>
<id>3</id>
I wonder how to achieve the line
<bussinessunit bussinesunitId="bisut100"/>
I tried using
DBMS_XMLGEN.setNullHandling(qryCtx, DBMS_XMLGEN.EMPTY_TAG);
and then the construction
qryCtx := DBMS_XMLGEN.newContext(
' select id, custom0 bussinessunit , company_id "@bussinessunitId", lname
from tpt_employees t
where rownum < 2
and custom0 is null');
Unfortunately, the resulting xml-line
<BUSSINESSUNIT bussinessunitId = "1" <BUSSINESSUNIT/>
is not the xml I had hoped for (it's not valid as well)